• Post category:Bolt Carrier Group
  • Post last modified:August 31, 2022
  • Reading time:37 mins read

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Best Bolt Carrier Group

The BCG is the best-known part of a gun. It is a small, metal device that fits into the breech of a firearm and helps to chamber rounds. BCGs come in many different sizes and shapes, but they all serve the same purpose: to make sure that each round is seated properly in the chamber before being fired.

Bolt Carrier Groups are the foundation for upgrading or building an AR platform rifle. A quality BCG ensures the reliable performance of a firearm.

There are many different types of BCGs on the market, so it’s important to choose one that is compatible with your particular firearm. The best way to do this is to consult with a gunsmith or other experts before making your purchase. Read our BCG reviews to get started.

Why do we need a Bolt Carrier Group?

The BCG allows making recoil lower with each shot by decreasing the reciprocating mass during the firing cycle, as well as staying on target even while fast shooting.

Best Picks

JP Enterprises Complete JPBC Bolt Carrier Group, 5 models

JP Enterprises Complete JPBC Bolt Carrier Group

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The large-frame JPBC-5 weighs more, but it allows shooting heavier bullets at higher velocities. The felt impulse is very tame and greatly improves follow-up shots.

DANIEL DEFENSE M16 BOLT CARRIER GROUP

DANIEL DEFENSE M16 BOLT CARRIER GROUP

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The Drop-In, complete, Mil-spec Assembly is Shot-peened for increased surface strength and durability. An extractor booster delivers reliable cycling during rapid semi-auto or full-auto fire. A duly staked gas key prevents gas leakage.

Budget Picks

FOXTROT MIKE PRODUCTS BOLT CARRIER ASSEMBLY

FOXTROT MIKE PRODUCTS BOLT CARRIER ASSEMBLY

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The FM-9 BCG operates with any kind of ammo. The Bolt weight is removable so you can use the law-tactical buffer tube hinge assembly. Properly resets drop-in single-stage triggers such as CMC/Lantac.

Faxon Firearms Gen 2 9mm PCC Bolt Carrier Group

Faxon Firearms Gen 2 9mm PCC Bolt Carrier Group

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The 9mm Complete BCG is dually compatible with Glock and Colt-Style Lower Receivers.

Easy disassembly due to the standard firing pin cotter pin.

The recoil is negligible allowing for rapid repeated shots.

Top 23 Best Bolt Carrier Group

#1 2A ARMAMENT BOLT CARRIER GROUP LIGHTWEIGHT ADJUSTABLE

2A ARMAMENT BOLT CARRIER GROUP LIGHTWEIGHT ADJUSTABLE

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Specification

Cartridge: 223 Remington, 5.56 mm NATO, 300 AAC Blackout
Make: AR-15

The RBC is a lightweight carrier with a gas regulating gate built into the carrier itself, allowing the operator to restore the weapon to a factory full-weight system by simply swapping the full-mass carrier back into the rifle. The RBC can be tuned to most combinations of springs, buffers, suppressors, and barrel lengths. The main materials are 8620 steel for Carrier, 9310 steel for Bolt, 7075-T6 for the Rear body, and 6AL-4V Titanium for the regulating gate. The T-6 Torx tool for adjustment should be used.

Pros
  • Made in the USA

  • Easy to drop in AR-15’s gas system: no need for adjustable gas blocks

  • No longer gas directed in eyes or nose, now it all goes out of the ejection port

  • Patent Pending

  • Can be adjusted in an infinite number of ways: from fully open, to fully closed on the regulating gate through the port door

  • Effectively redirects gas and lessens the gun’s recoil

Cons
  • Not yet

#2 BATTLE ARMS DEVELOPMENT INC. ENHANCED BOLT CARRIER GROUP

BATTLE ARMS DEVELOPMENT INC. ENHANCED BOLT CARRIER GROUP

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Specification

Cartridge: 5.56 mm NATO
Finish: Black Nitride

#3 WMD GUNS NICKEL BORON BOLT CARRIER GROUPS

WMD GUNS NICKEL BORON BOLT CARRIER GROUPS

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Specification

Cartridge: 5.56 mm NATO
Finish: Nickel-Boron

The BCG fits mil-spec AR-15/M16 upper receiver. The Extractor comes with a black O-ring, black buffer, and spring. The Carrier is machined from 8620 carbon steel, and Bolt is from Carpenter 158 steel alloy.

Pros
  • All surfaces are NiB-X nickel boron coated: super-smooth, corrosion- and abrasion-resistant proprietary NiB-X coating (harder-than-chrome surface) decreases friction, adding the inherent lubricity of the BCG

  • Meets government M16 specs

  • The slick finish keeps carbon from adhering, making cleaning easier and faster

  • The matching NiB-X coated hammer for the smoothest cycling

  • M16 carrier available

  • The WMD logo is engraved

  • Great attention to detail

  • Brownells lifetime guarantee

  • Built like a tank

  • Looks very sharp

  • After 500 rounds it still cleans up nicely and runs smoothly

  • The gas ring fits a very tight, good seal

Cons
  • WMD trigger assembly feels gritty on the pull

#4 RUBBER CITY ARMORY BOLT CARRIER GROUP TITANIUM

RUBBER CITY ARMORY BOLT CARRIER GROUP TITANIUM

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Specification

Cartridge: 223 Remington, 5.56 mm NATO, 300 AAC Blackout
Finish: Black

The BCG with a Titanium M16 profile carrier can be paired with standard AR-15 or M16 parts. The Bolt is made from steel (9310), and the billet gas key is properly staked and torqued.

Pros
  • The proprietary aerospace nitride coating of the carrier delivers sturdiness and wear resistance

  • Made in the USA

  • Tool steel extractor and cam pin run properly

  • An ultra-lightweight BCG helps in minimizing the cycling trigger following malfunction conditions

  • Super-fast firing combined with my Geissele Trigger Group

  • An adjustable gas block helps to prevent the FTE’s from the over-gassing issues, as well as to reduce felt recoil

  • The titanium BCG is extremely light: at 3.3 ounces lighter than a traditional BCG

Cons
  • Not yet

#5 RADIAN WEAPONS ENHANCED BOLT CARRIER GROUP

RADIAN WEAPONS ENHANCED BOLT CARRIER GROUP

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Specification

Cartridge: 5.56 mm NATO
Finish: Black

The BCG for AR15/M16 (full auto) platform allows to minimize carrier tilt and decrease friction inside the upper receiver by relocating key bearing surfaces. The steel (4130) Gas Key features Grade 8 hardware attachment and uses due staking techniques. The Bolt and Carrier are case hardened from steel (9310 & 8620 correspondingly) and covered with black Nitride.

Pros
  • Functions flawlessly with many guns

  • Fantastic coating

  • Aesthetically Pleasing

  • Simple to mount

  • All tolerances, materials, and coatings meet Mil-spec standards to ensure due performance, dependability, and sturdiness

Cons
  • Not yet

#6 FAXON FIREARMS BOLT CARRIER GROUP

FAXON FIREARMS BOLT CARRIER GROUP

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Specification

Cartridge: 5.56 mm NATO
Finish: Black Nitride

The BCG will upgrade your Mil-Spec AR-15 rifle build, providing high-quality inner parts (a spring, Crane O-ring, and insert already installed). The M16 BCG of tool steel (9310) is heat-treated and shot-peened to military specs for proper compatibility with full-auto lowers.

Pros
  • Magnetic particle inspected

  • Chamfering on the rear of the locking lugs enhances reliability

  • All-black finish, Salt-bath Nitride treated

  • The serrations are paired with the upper receiver’s forward assist

  • Great fit and finish

  • Goes in much easier and stays tight

Cons
  • The firing pin seems oversized and bent out so had to replace it

  • Poor quality control: machining marks all over the carrier tail

  • Gas key staking is weak and very sharp

  • The firing pin hole is .063, which is oversized

#7 AERO PRECISION BOLT CARRIER GROUP

AERO PRECISION BOLT CARRIER GROUP

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Specification

Cartridge: 5.56 mm NATO
Finish: Black

#8 FOXTROT MIKE PRODUCTS BOLT CARRIER ASSEMBLY

FOXTROT MIKE PRODUCTS BOLT CARRIER ASSEMBLY

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Specification

Cartridge: 9 mm Luger
Finish: Black Nitride

The FM-9 BCG is crafted from a single piece of premium steel alloy (8620H), and covered with a deep-penetration salt bath Nitride (SBN). The unit comes complete with serrations for a forward assist, an installed firing pin, and an extractor; it isn’t compatible with the Stern Defense MAG-AD9 mag block. The firing pin retainer is a titanium screw instead of a split pin.

Pros
  • Smooth, Reliable Cycling of 9MM AR style pistols and carbines with Glock-style mags only

  • Ready to go

  • SBN coating delivers both lubricity and wear-resistance

  • “Ramped” to accommodate both standard GI and dedicated 9-mm hammers

  • Machined in a facility with ISO:9001 and AS:9100 quality certifications

  • Made in the USA

  • Lightweight with minimum modification such as removing magazine blocks, and replacing a standard bolt lock

  • Eliminates bolt jamming rounds in chamber issues

  • The great overall design for both rounds pick up and ejection

  • Affordable, Costto Value

  • Excellent professional, helpful, knowledgeable customer service

  • No a single ftf or fte

  • Runs with any kind of ammo

  • The firing pin is top-notch

  • The forward bolt assist feature is nice to have

  • The Bolt weight is removable so you can use the law-tactical buffer tube hinge assembly

  • Fits perfectly with PSA 9M AR, allowing the echo II trigger to work flawlessly without any modifications

  • Have run over 1000 rounds through it and it performed flawlessly with Glock mags

  • Fits without slop in the upper receiver

  • Properly resets drop-in single-stage triggers such as CMC/Lantac

Cons
  • Not yet

#9 BROWNELLS LIGHTWEIGHT BOLT CARRIER GROUP

BROWNELLS LIGHTWEIGHT BOLT CARRIER GROUP

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Specification

Cartridge: 5.56 mm NATO
Finish: Nickel-Boron

The M16 BCG allows enhancing the rifle’s performance with a simple component swap, excluding the need for major part replacement or amateur gunsmithing work. The unit is manufactured from 8620 tool steel, while a heavy-duty bolt from 9310 tool steel; is available with nickel-boron, titanium-nitride, or nitride coatings. The BCG comes with the needed black insert and O-ring around the extractor, as well as a torqued and staked gas key.

Pros
  • Magnetic-particle inspected to provide quality

  • Lightweight allows to diminish the felt recoil of any AR-style firearm

  • Completely assembled

Cons
  • Not yet

#10 BROWNELLS 308AR BOLT CARRIER GROUPS

BROWNELLS 308AR BOLT CARRIER GROUPS

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Specification

Cartridge: 308 Winchester
Finish: Black Nitride

The Big-Bore BCG operates reliably in DPMS LR-308 pattern rifles chambered in .308, .338 Federal, 6.5mm Creedmoor, .243, 7mm-08, .260 Remington, or any other cartridge based on the .308 Winchester. Both items come complete with a firing pin, firing pin retaining pin, cam pin, gas rings, gas key, extractor, and ejector installed. The BCG isn’t compatible with Armalite rifles.

Pros
  • Meets standards of M16-style BCGs

  • Magnetic particle inspected (MPI)

  • Carrier features forward assist notches

  • The extractor is installed with rubber insert and spring

  • Gas key screws are torqued and staked

  • Hard Black Nitride finish is resistant to surface wear, and self-lubricating to boot

  • Passes head space for Faxon .308

  • No slop in the upper

  • Fits Aero Precision upper and barrel perfectly, a Troy .308 and a Bushmaster .308 barrel as well

  • No issues with feeding, extraction, or ejection

  • Perfect gaskey staking

  • Gas rings are decently tight

  • The bolt cam cleared the gas key with enough clearance to make removal and assembly easy

  • The machining and finish are excellent

  • Quality OEM

Cons
  • Terrible extractor

  • Tested with Clymer gauges in a Criterion barrel, this failed headspace: would not close on the Go gauge (might work in barrels with less tight tolerances)

  • Failed to extract several brands of ammo

  • Jams into the ejection port

  • Ruins brass

  • Some sharp edges and corners

  • Wrong dimensions affect headspace

  • Works ok with no mag, put in a Magpul and a D&H steel mag and the bolt hung on the follower first, depressed follower through the ejection port, and carrier itself does not clear either mag

#11 COLT M16 BOLT CARRIER GROUP

COLT M16 BOLT CARRIER GROUP

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Specification

Cartridge: 5.56 mm NATO
Finish: Black

This is a complete, mil-spec assembly with bolt, bolt carrier, and firing pin ready to drop into the rifle or carbine upper, fitting Mil-spec semi-auto and full-auto AR-15/M16 upper receiver chambered for .223/5.56mm. The M16-style carrier on the black phosphate model comes with a full-length shroud for tripping auto sear for mounting on full-auto law enforcement and military rifles.

Pros
  • High-pressure tested and magnetic particle inspection tested

  • Properly staked gas key prevents gas leakage or short stroking

  • Carrier and gas key are chrome lined for smooth cycling and long-lasting wear-resistance to hot combustion gasses

  • Made in the USA

  • The famous Colt gold extractor spring

  • The perfect length of both bolt carriers

Cons
  • The carrier wouldn’t go into any AR receiver: the hole in the key, which accepts the gas tube wasn’t drilled deep enough, there was a clear “step” that kept the gas tube from going in the final 0.25″

  • No “C” stamp or “MPC” label at all

  • Gas key bolts are poorly staked

  • Mars on the bolt shaft

  • Poor/sloppy finish at the front of the carrier: it wears off without even being fired

#12 BRAVO COMPANY M16 BOLT CARRIER GROUP

BRAVO COMPANY M16 BOLT CARRIER GROUP

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Specification

Cartridge: 223 Remington, 5.56 mm NATO, 300 AAC Blackout
Finish: Black

The complete BCG with a proper Mil-Spec gas key, tool steel machined extractor, and ejector with BCM Spring, is fully assembled for your AR15, M16, or M4. The Flat Dark Earth version features the stripped carrier finished with an Ion Bond coating to lower friction and simplify cleaning.

Pros
  • Parkerized exterior and chrome lined inside the carrier

  • Machined to USGI specs

  • Strong staking

  • Propergas system functioning

  • HPT and MPI

  • Shot peened for increased strength

  • Oiled upwell

  • Heavy duty and machined with tight tolerances

  • Excellent Fit and finish

Cons
  • Some of the tops of the forward assist teeth are damaged

  • Poor quality and unhelpful customer service

  • After less than a thousand rounds the extractor lip sheared off

  • Feeding issues: after firing around 200 rounds one of the gas key screws sheared off and became jammed which caused the bolt carrier to get stuck

#13 DANIEL DEFENSE M16 BOLT CARRIER GROUP

DANIEL DEFENSE M16 BOLT CARRIER GROUP

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Specification

Length: 3.5 in
Weight: 0.5 lb
Height: 1.25 in
Width: 1.5 in

The Drop-In, complete, Mil-spec Assembly comes with a bolt, bolt carrier, and firing pin. The M16-style carrier on the black phosphate model is equipped with a full-length shroud for tripping auto sear; it can be installed on Mil-spec semi-auto and full-auto AR-15/M16 law enforcement and military rifles.

Pros
  • Shot-peened for increased surface strength and durability

  • An extractor booster delivers reliable cycling during rapid semi-auto or full-auto fire

  • The duly staked gas key prevents gas leakage

  • Extraction fits snug and securely

  • Slings the rounds way away from the shooter’s position

  • Aside from headspace issues: tried it on 3 different GO GAUGES, and the quality of the carrier is superb

  • The key is properly staked and there is no play at all or chances coming loose on

  • DD’s phosphate coating is slightly more difficult to clean: however porous finish does a better job at trapping lubricants and holding it where it is most needed much better than self-lubricating treatments such as NiBr, ion bonded, etc

  • Beefy bolt

  • ZERO issues with anything

Cons
  • Not yet

#14 BOOTLEG INC M16 ADJUSTABLE BOLT CARRIER GROUP

BOOTLEG INC M16 ADJUSTABLE BOLT CARRIER GROUP

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Specification

Cartridge: 223 Remington
Finish: Black

The Complete AR-15 Adjustable BCG is good for rifles fitted with sound suppressors. Four adjustable vent settings allow mitigating of the gas flow, causing less blowback, affecting carrier speed and shooter accuracy. Restricting the gas flow into the expansion chamber inside the carrier slows down the action, the same thing restricting the gas block does.

Pros
  • Made in the USA

  • Controls gas flow for better rifle performance and suppressor usage

  • Easily fine-tuned with a flathead screwdriver

  • Mil-spec staked gas key

  • Machined from S7 tool steel for heavy-duty and long-lasting service

  • Full auto rated

  • Lithium isonite coated for lubricity and wear resistance

Cons
  • Not yet

#15 BROWNELLS – M16 BOLT CARRIER GROUP TiN MP

BROWNELLS - M16 BOLT CARRIER GROUP TiN MP

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Specification

Cartridge: 5.56 mm NATO
Finish: Titanium Nitride

The TiN M16 BCG is completed with an M16 carrier notch, torqued and staked gas key, and an O-ring already installed on the extractor.

Pros
  • Stunning look

  • Provides reliable performance in full-auto rifles

  • Ready to install

  • Smooth operation

  • Great coating and color

  • Very unique looking when the dust cover pops open

  • Lifetime warranty

  • No tooling marks, slick as glass, and a beautiful matte finish

Cons
  • Fails to feed in each one of 10-rd mags, in random order

  • Seems like the matte finish is causing drag when it goes over the mag

  • Machining marks from end to end: it’s not polished before the coating process

  • The visible wear from the contact with the hammer: would like the color to last a little longer than a few hundred rounds on the bottom of the carrier

  • An issue with gas key and bleeding of gas

  • Has cracks in each place the gas key is staked

  • The BCG was completely out of spec causing major jamming and gouged metal out of the upper

#16 Aero Precision AR15 Grendel Bolt Carrier Group

Aero Precision AR15 Grendel Bolt Carrier Group

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Specification

Color: Black
Finish: Nitride
Fabric/Material: 8620 Steel
Caliber: 6.5mm Grendel
Gun Model: AR-15

The 6.5 Grendel bolt is crafted from long-lasting Carpenter 158 tool steel, the carrier from 8620 steel. The Black Nitride Finish is a modern lower friction coating, which minimizes the need for lubricants and cleaning. The Carrier features forward assist serrations; a Black o-ring insert is on the extractor. The carrieris cutto a standard M16 style.

Pros
  • Stands up to high round counts or high-speed competition shooting

  • M16-cut carrier

  • Shotpeened

  • Type 2 Bolt Face (.136)

  • HPT tested/MPI marked

  • Doesn’t need much cleaning or lubrication

  • Properly staked gas key

  • Smooth precision

  • Glides smoothly

  • Exactly lined up with a barrel

Cons
  • The firing pin retention pin (which looks like a cotter key) was removed only after using heavy-duty long nose pliers

  • Found it to be rusted

#17 Faxon Firearms Gen 2 9mm PCC Bolt Carrier Group

Faxon Firearms Gen 2 9mm PCC Bolt Carrier Group

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Specification

Color: Black
Finish: Salt Bath Nitrided
Fabric/Material: Mil-Spec 8620 Steel
Caliber: 9mm Caliber
Gun Model: AR-15
Weight: 14.9 oz

The 9mm Complete BCG is crafted from Mil-Spec steel (8620) with a Black Salt Bath Nitride finish. The Gen 2 PCC blow-back BCG is suitable for both weekend plinking and competitive shooting.

Pros
  • Dual compatibility with Glock and Colt-Style Lower Receivers

  • A ramped bottom fits any common trigger

  • Stronger firing pin

  • Fully Heat-Treated

  • External M-16 Style Extractor

  • M16 (Full-Auto) Compatible with Dust Cover, JP Enterprises and similar buffer systems, and MP5 magazine lower receivers

  • Easy disassembly due to the standard firing pin cotter pin

  • Runs flawlessly

  • Cycles quickly and smoothly

  • Zero is sues with ejecting

  • No double feeds or squibs

  • The firing pin holds up perfectly after about 200 rounds

  • No horrids carring

  • Easy to clean/dismantle

  • The recoil is negligible allowing for extremely rapid repeated shots, all placed within an inch at 75 feet, using flip-up iron sights

  • Even without a 9mm ejection port dust cover casings don’t hit left-hand shooters, as they are ejected straight to the side

Cons
  • California’s Proposition 65

  • In the case of incomplete assembly: the roll pin wasn’t installed at the BCG rear

#18 TRYBE Defense Milspec Hybrid Bolt Carrier Group

TRYBE Defense Milspec Hybrid Bolt Carrier Group

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Specification

Finish: Black Nitride
Fabric/Material: 8620 Steel
Caliber: 9mm Caliber

The Mil-Spec AR-15 9mm Hybrid Complete BCG integrates the bolt, gas key, bolt carrier, firing, cam pins, and retaining pin for the firing pin. The BCG is constructed from Steel (AISI 8620- Bolt Carrier, AISI 9310 – Bolt, AISI 4140 – Gas Key, S7 Tool -Steel Extractor, AISI 8670 – Firing Pin, Chrome Coated), Black Nitride QPQ-treated (Rockwell Harness – 78-80 HRc).

Pros
  • Trybe warranty

  • A perfect match for recoil and consistent feeding

  • Ultra-durable and corrosion-resistant material

  • Operates with both Glock and Colt style lower receivers

  • Enhanced Ejector

  • Smooth as butter

  • High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI)

  • Fully assembled Mil-Spec BCG with Hardened Fasteners

  • Gas Key Staked to Mil-Spec Standards

  • Shot Peened

  • Comes oiled

  • Laser Engraved TRYBE Eagle Logo

Cons
  • Doesn’t reset the disconnect: it only fires and ejects the first round then a manual reset is needed to fire again

  • Not drop in with the lower receiver

  • Bad quality control: the bolt carrier insert was installed upside down with the ramp towards the middle of the carrier

#19 FosTech Outdoors Complete Lite Bolt Carrier Group

FosTech Outdoors Complete Lite Bolt Carrier Group

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Specification

Finish: Nickel Boron
Gun Model: AR-15

The full-profile Outdoors Lite BCG is suitable for any standard full-auto AR-15 rifle. The Bolt is machined from Steel (9310), and the Carrier’s Material is Steel (8620).

Pros
  • The wear-resistant long-lasting Nickel Boron coating decreases friction

  • Reliable and lightweight

  • Solidly constructed

  • Easy to clean

Cons
  • Assemblyis seriously spotty

  • Staking is inconsistent

#20 JP Enterprises Complete JPBC Bolt Carrier Group

JP Enterprises Complete JPBC Bolt Carrier Group

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Specification

Fabric/Material: Stainless Steel
Caliber: .308 Caliber
Gun Model: AR-10
Gun Frame Size: Large
Hand: Right

The 416 stainless steel Full Mass Operating System (FMOS) carrier is heavier than a standard .308 carrier. The large-frame JPBC-5 comes with extended forward assist serrations, a dust cover notch, an increased bearing surface for smoother operation, improved alignment and lower wear in the upper receiver as well as a longer Mil-spec cocking pad for optimal reliability.

Pros
  • Great for accuracy

  • JP bolt is what standard head spacing for AR10 barrels are set off of

  • Weights more, but it allows you to shoot heavier bullets at higher velocities

  • Excellent finish and build quality

  • Easy Installation

  • Super smooth and dependable

  • Cuts down on recoil quite a bit: The felt impulse Is very tame and greatly improves follow-up shots

  • Tunable

  • Wipes clean

  • Any part of the assembly isn’t overlooked

Cons
  • California’s Proposition 65

  • A bit costly

#21 Angstadt Arms Bolt Carrier Group

Angstadt Arms Bolt Carrier Group

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Specification

Color: Black
Fabric/Material: 8620 Alloy Steel
Caliber: 9mm Luger
Gun Make: Colt, Glock
Gun Model: AR-15
Hand: Right
Additional Features: Features removable weight for use with Law Tactical folding stock adapter

The 9MM BCG can be paired with AR-15 Lower Receivers and Colt Style one as well. The Bolt is made from Steel and Carrier is from 8620 Alloy Steel with Black Nitride Finish.

Pros
  • Well constructed and designed

  • Fits factory upper perfectly

  • Features removable mass to allow for captured buffer springs to be able to function

  • The Bolt has standard small parts, typical of the AR9 platform, and is easy to service

  • Smooth finishing machinery

Cons
  • California’s Proposition 65

#22 RISE Armament Low-Mass Bolt Carrier Group

RISE Armament Low-Mass Bolt Carrier Group

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Specification

Color: Black
Finish: Black Nitride
Fabric/Material: 8620 Steel, 9310 Steel
Caliber: 5.56x45mm NATO, .223 Remington
Gun Model: M16, AR-15
Weight: 0.56 lb

The Bolt is precision-machined from 9310 Steel and individually inspected for top-notch performance: The Carrier is heat-treated and case hardened from 8620 Steel, the Gas key is from tool steel (grade 8), Cam pin (4140 steel), The extractor is shot peened from tool steel.

Pros
  • Due to the Lightweight is easy to create a tactical, mobile firearm for training

  • Hardened and staked properly Gas key fasteners

  • Quality black nitride finish ensures simple cleaning of some accumulated carbon, and easy restoring of the lustrous shine

  • Fits lighter buffers to allow faster follow-up shots

  • Individually MPI tested

Cons
  • California’s Proposition 65

  • Not yet rated

#23 Stern Defense SD BU45 ACP Bolt Carrier

Stern Defense SD BU45 ACP Bolt Carrier

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Specification

Color: Black
Fabric/Material: Melonite
Caliber: .45 ACP
Additional Features: Compatible with the JP Silent capture spring(not recommended for 45acp), Compatible with the Echo trigger., Compatible with the Law Folding Tactical Stock, Compatible with single-stage short reset triggers, Custom 4140 billet extractor providing superior ejection., Constructed from 8620 AISI steel

The bolt can be paired into Mil-Spec and Glock-pattern upper receivers (45ACP uppers should have an enlarged ejection port), with Colt SMG, Glock mags, and the JP Silent captured spring (not recommended for 45acp), and standard AR15/M16 charging handles. The Bolt Carrier comes with a firing pin with spring, an extractor with spring, a retaining pin, and proprietary center and roll pins. It’s recommended to use the BC with a carbine buffer (11-oz or heavier). The fully-assembled BC is crafted from AISI steel (8620), covered with Black Melonite and Phosphate Chrome.

Pros
  • Custom 4140 billet extractor ensures perfect ejection

  • Glock cut

  • Compatible with single-stage short reset triggers, the Law Folding Tactical Stock

  • Share Tweet Pinit +1

  • Clean machining lines

Cons
  • A bit pricey compared to other BCGs

FAQ

The BCG, or bolt carrier group, is one of the most important parts of an AR-15. It is responsible for cycling the ammunition and keeping the gun functioning. Because of this, it is important to choose a BCG that is high quality and will function properly in your gun.

There are a number of BCGs on the market, and many shooters believe that there is no one “best” BCG. However, there are some BCGs that are considered to be higher quality than others. BCGs can be made from a variety of materials, including steel, aluminum, and titanium. They can also be coated with different finishes, such as nickel boron or titanium nitride.

When choosing a BCG, it is important to consider the weight and durability of the material it is made from, as well as the finish of the coating. You should also make sure that the BCG is compatible with your AR-15. Some BCGs are designed for use in certain types of AR-15s, and may not be compatible with all models.

Can you use any BCG in an AR-15?
No, not all BCGs will work in all AR-15s. You need to make sure that the BCG you choose is compatible with your particular gun. BCGs can be designed for different types of AR-15s, such as those with full auto or semi-auto selector switches.
How does a bolt carrier group work?
The BCG is responsible for cycling the ammunition and keeping the gun functioning. It accomplishes this by moving the bolt back and forth within the gun. When the gun is fired, the BCG moves the bolt backward, pulling the cartridge out of the chamber and ejecting it. The BCG then moves forward, loading a new cartridge into the chamber.
What makes a BCG full auto rated?
A BCG is full auto-rated if it is capable of withstanding the higher pressures that are generated when the gun is fired in full auto mode. BCGs that are not full auto-rated may not be able to handle the increased pressure and may fail prematurely.
What should I look for in a BCG AR-15?
When choosing a BCG for your AR-15, you should consider the weight and durability of the material it is made from, as well as the finish of the coating. You should also make sure that the BCG is compatible with your AR-15. Some BCGs are designed for use in certain types of AR-15s, and may not be compatible with all models.

Conclusion

The BCG is the bolt carrier group, which is a key component of the AR-15 rifle. It is responsible for cycling the ammunition and keeping the weapon operational. The BCG is often referred to as the “heart” of the AR-15.

While choosing the BCG make sure to take the proper precaution and check the headspace for your rifle. Known some cases when the bolt doesn’t cycle even after trying it on 3 different GO GAUGES. Anyway, your gas port size, buffer weight, and buffer spring tension should be always serviceable.

Tags: #best bolt carrier group / #best ar 15 bolt carrier group / #best ar 10 bolt carrier group / #best ar bolt carrier group / #best bolt carrier group coating

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