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Table of Contents
- Why do we need a Bolt Carrier Group?
- Best Picks
- Budget Picks
- Top 23 Best Bolt Carrier Group
- #1 2A ARMAMENT BOLT CARRIER GROUP LIGHTWEIGHT ADJUSTABLE
- #2 BATTLE ARMS DEVELOPMENT INC. ENHANCED BOLT CARRIER GROUP
- #3 WMD GUNS NICKEL BORON BOLT CARRIER GROUPS
- #4 RUBBER CITY ARMORY BOLT CARRIER GROUP TITANIUM
- #5 RADIAN WEAPONS ENHANCED BOLT CARRIER GROUP
- #6 FAXON FIREARMS BOLT CARRIER GROUP
- #7 AERO PRECISION BOLT CARRIER GROUP
- #8 FOXTROT MIKE PRODUCTS BOLT CARRIER ASSEMBLY
- #9 BROWNELLS LIGHTWEIGHT BOLT CARRIER GROUP
- #10 BROWNELLS 308AR BOLT CARRIER GROUPS
- #11 COLT M16 BOLT CARRIER GROUP
- #12 BRAVO COMPANY M16 BOLT CARRIER GROUP
- #13 DANIEL DEFENSE M16 BOLT CARRIER GROUP
- #14 BOOTLEG INC M16 ADJUSTABLE BOLT CARRIER GROUP
- #15 BROWNELLS – M16 BOLT CARRIER GROUP TiN MP
- #16 Aero Precision AR15 Grendel Bolt Carrier Group
- #17 Faxon Firearms Gen 2 9mm PCC Bolt Carrier Group
- #18 TRYBE Defense Milspec Hybrid Bolt Carrier Group
- #19 FosTech Outdoors Complete Lite Bolt Carrier Group
- #20 JP Enterprises Complete JPBC Bolt Carrier Group
- #21 Angstadt Arms Bolt Carrier Group
- #22 RISE Armament Low-Mass Bolt Carrier Group
- #23 Stern Defense SD BU45 ACP Bolt Carrier
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.
JP Enterprises Complete JPBC Bolt Carrier Group, 5 models
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
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.
FOXTROT MIKE PRODUCTS BOLT CARRIER ASSEMBLY
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
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
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.
#2 BATTLE ARMS DEVELOPMENT INC. ENHANCED BOLT CARRIER GROUP
#3 WMD GUNS NICKEL BORON BOLT CARRIER GROUPS
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.
#4 RUBBER CITY ARMORY BOLT CARRIER GROUP TITANIUM
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.
#5 RADIAN WEAPONS ENHANCED BOLT CARRIER GROUP
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.
#6 FAXON FIREARMS BOLT CARRIER GROUP
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.
#7 AERO PRECISION BOLT CARRIER GROUP
#8 FOXTROT MIKE PRODUCTS BOLT CARRIER ASSEMBLY
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.
#9 BROWNELLS LIGHTWEIGHT BOLT CARRIER GROUP
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.
#10 BROWNELLS 308AR BOLT CARRIER GROUPS
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.
#11 COLT M16 BOLT CARRIER GROUP
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.
#12 BRAVO COMPANY M16 BOLT CARRIER GROUP
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.
#13 DANIEL DEFENSE M16 BOLT CARRIER GROUP
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.
#14 BOOTLEG INC M16 ADJUSTABLE BOLT CARRIER GROUP
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.
#15 BROWNELLS – M16 BOLT CARRIER GROUP TiN MP
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.
#16 Aero Precision AR15 Grendel Bolt Carrier Group
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.
#17 Faxon Firearms Gen 2 9mm PCC Bolt Carrier Group
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.
#18 TRYBE Defense Milspec Hybrid Bolt Carrier Group
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).
#19 FosTech Outdoors Complete Lite Bolt Carrier Group
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).
#20 JP Enterprises Complete JPBC Bolt Carrier Group
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.
#21 Angstadt Arms Bolt Carrier Group
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.
#22 RISE Armament Low-Mass Bolt Carrier Group
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.
#23 Stern Defense SD BU45 ACP Bolt Carrier
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.
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.
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.
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