• Post category:Bolt Carrier Group
  • Post last modified:September 3, 2022
  • Reading time:23 mins read

Affiliate Disclosure: AmmoCave.com sometimes gets paid for listings, through sponsors or affiliate programs like Lucky Gunner, Optics Planet, Brownells, Cabelas, Academy Sports & Outdoors, Rainier Arms, Palmetto State Armory, Sportsman’s Guide, Ammo.com, Ammo Man, Primary Arms, MidWayUsa, Amazon, eBay, etс. Clicking a link helps keep AmmoCave.com free, at no extra cost to you!

Authors: Each article is verified by AmmoCave's expert team. Professional hunters and gun experts write the articles. AmmoCave Team independently researches, tests, reviews, and uses recommendations from our community of gun owners. We may earn commissions from shopping links.

Note: The views and opinions expressed in this article are those of the authors and do not necessarily reflect any agency's official policy or position. The articles are for informational purposes only, share your opinions about Best 308 BCG in the comments and join the discussions. Let's share 💬 our ammo & gun experiences together!

Best 308 BCG

The 308 BCG is the bolt carrier group for the 308 Winchester rifle cartridge. It is a precision machined component that performs several critical functions in the operation of the rifle. The BCG includes the bolt, barrel extension, firing pin, cam pin, and gas key.Make your AR build look fierce and run at a high level due to a new Bolt Carrier Group.

Why do we need a 308 BCG?

The BCG is important because it helps to cycle the rounds through the gun. It is also important for accuracy and reliability.Bolt Carrier Groups allow improving 308 rifles operation to provide optimal performance.

Top 16 308 BCG

#1 Spikes Tactical .308 Bolt Carrier Group

Spikes Tactical .308 Bolt Carrier Group

View on OpticsPlanet

Specification

Fabric/Material: 8620 Tool Steel
Caliber: .308 Caliber

The .308 DPMS Style BCG integrates a carrier (8620 tool steel), bolt, extractor, and gas key (9310 tool steel) with Chrome Inside, Firing Pin with Hard Chrome Finish, Cam Pin Phosphate coating, Retaining Pin. The BCG is available with Nickel boron or Phosphate coating.

Pros
  • Tough composition

  • Precision-machined components

  • DPMS Style

  • Nicely-seen Laser Engraved ST Spider Logo when the dust cover flips open

  • Chrome interiors of parts

  • Full-Auto carrier

  • Shot-Peened Bolt

  • Properly-Staked Gas Key: Grade 8 Hardware

  • Operates well on DPMS GEN 1 LR308/AR10 rifles

  • The bolt is smooth and easy to clean

Cons
  • Not yet

#2 Ballistic Advantage .308 Bolt Carrier Group

Ballistic Advantage .308 Bolt Carrier Group

View on OpticsPlanet

Specification

Caliber: .308 Caliber

#3 Aero Precision .308 Black Nitride BCG

Aero Precision .308 Black Nitride BCG

View on OpticsPlanet

Specification

Fabric/Material: 4130 Stee
Caliber: .308 Caliber

The .308/7.72 Complete Bolt Carrier Group parts are constructed from different steel types: the Billet carrier with Forward Assist serrations is from 8620 steel and case hardened, the Bolt is from 9310 Steel and shot peened, the Carrier Gas Key is made of 4130 Steel (attached with Grade 8 hardware and duly staked), the Carrier Firing Pin is from 8740 steel and hard chrome coated, the Bolt Extractor is from 4340 Steel with double o-rings and double springs.

All BCG components are black nitride coated to decrease friction during use and provide durable and reliable operation with multi calibers .308, 6.5 Creedmoor, 7.62×51, .338 Federal, and other .308 based cartridges. The external surfaces of high-pressure bolts are CNC ground after heat-treatment to ensure a precision fit. The firingpinhole diameter is diminished to .070 in.

Pros
  • Ideal for big-bore rifle builds

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

  • A laser engraved Aero Precision logo on the carrier

  • The cutting-edge lower-friction Black Nitride coating minimizes the necessity for lubricants and cleaning

  • The carrier fits DPMS, which is paired with style AR Rifles

  • The flawless cycling at any rate of fire with all standard ammo: the first operation of 20 lake city rounds cycle well during slow to fast work

  • Fine tolerances

  • Velvety smooth

  • Reasonable price

  • The finish features little friction

Cons
  • Doesn’t fit

  • Poor Quality Assurance

  • The Carrier isfor AR10 but will not fit .308 round without some more machining, the normal casing should be 12 mm but on the BCG it is only 11.7 mm (measuring with a caliper)

  • A thin layer of blue rust out of the box

  • Easy to clean

  • Does not fire bullets down the range, because the extractor locks in place

  • Rough edges at corners cause the bolt to not slide

  • The damage on tip of the fire pin

  • The bolt acts stuck/sticks when using the charging handle with or without ammo

  • Jagged rough subpar machining

  • The finish is slick and the machining is clean

  • Not High-Pressure bolt as it’s advertised

  • The extractor doesn’t work: the empty case or dummy round in the chamber isn’t extracted, even after pulling the charging handle manually

#4 TRYBE Defense Milspec Complete 308 Bolt Carrier

TRYBE Defense Milspec Complete 308 Bolt Carrier

View on OpticsPlanet

Specification

Fabric/Material: 8620 Steel
Caliber: .308 Winchester
Gun Model: AR-10
Included Accessories: No Forward Assist

The fully-assembled BCGs integrate the shot-peened bolt, bolt carrier without Forward Assist Serrations, properly-staked gas key, cam pin, firing pin, and firing pin retaining pin. TheAR-10s (.308-chambered)- and DPMS-compatible BCG is made from 8620 steel and hardened to mil-spec conditions to ensure long-lasting dependable service. The BCGs come oiled, they still should be clean and oiled regularly.

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

  • Rock-solid and corrosion-resistant steel (8620)

  • Improved Ejector, Firing Pin Retaining Pin, and Extractor Pin

  • Nitride-Treated Gas Key & Extractor, Bolt Carrier (AISI8620 Steel),Bolt (AISI 9310 Steel)

  • A nice uniform black semi-gloss finish, which is easy to keep clean

  • Fit smoothly into the upper

  • The forward assist notches engage as they should, the internal fit and finish are good

Cons
  • California’s Proposition 65

  • Needs to do modifications for it to work

  • Case of failing to fire while the pin and the bolt are nothing wrong

  • From the factory the gas port was a little too small for the gas tube to slide in: had to remove about .0010 of material from the port

  • Not mil-spec

  • Requires breaking-in at both high and low rates of fire: after firing a shot and it didn’t eject all the way, after about 10 rounds it became cycling better

  • The BCG jammed and bit into the round 20 times: had to pop the upper of the lower and use a pinch to slightly pry the BCG back then it would slide back and pop the round that didn’t fire out

  • The bolt cam pin isn’t in-spec: the BCG has chewed up 2 of the bottom-front portion of the charging handles (the portion which is under where the gas tube and gas key meet)

#5 FailZero AR10 308 Bolt Carrier Group

FailZero AR10 308 Bolt Carrier Group

View on OpticsPlanet

Specification

Fabric/Material: 9310 Steel
Caliber: .308 Caliber
Gun Model: AR-15
Coating: EXO Nickel Boron

The BCG is compatible with DPMS Pattern and 6.5 Creedmoor, comes with Bolt (9310 Steel) and Extractor, Bolt Carrier (8620 Steel), Extractor, Cam Pin, Carrier Key, and Firing Pin. The AR10 .308 Assembled BCG without Hammer features the finish, which decreases friction, improving the overall firearm performance.

Pros
  • All essential components are coated with EXO nickel boron, corrosion- and wear-resistant, to deliver a permanent long-lasting dry lubricity

  • Ready-to-install drop-in component fits quickly and easily into the weapon

  • Magnetic Particle Inspected

  • Live Fire Tested

  • The bolt head is spaced perfectly on a budget 308 upper/barrel

  • The rear contacts the buffer as it should

  • Easy to clean and lube

Cons
  • A bit high price

  • Paired with a Strike Industries charging handle has many issues: every round jam up

  • The extractor doesn’t work: the empty round would barely come out of the chamber and would just sit in the open chamber above the magazine

  • Unreliable extractor spring causes feeding problems, not holding up to the round

  • The 6.5 Creedmoor is such a high-pressure round, that standard 308 BCGs are unable to contain the pressure and the firing pins are too long

  • The firing pin pushes through the primer, which blows the primer into the BCG, destroying the firing pin

#6 Alpha Shooting Sports Bolt Carrier Group

Alpha Shooting Sports Bolt Carrier Group

View on OpticsPlanet

Specification

Color: Steel
Finish: Premium Nitride
Caliber: .308 Caliber

The Complete M16 BCG assembly with side staked gas key and grade-8 fasteners is ready to install in an upper receiver and start shooting, being compatible with DPMS, CMMG & POF pattern rifles. The Bolt Carrier Groups are completed with forward assist serrations, which are needed to push the bolt carrier forward in case the rifle is too dirty or suffers from another malfunction.

Pros
  • Ensures inject superior performance into the rifle

  • Forward assist serrations

  • The full corrosion resistance of all major components (Carrier, Bolt, Extractor, and gas key) due to the Premium QPQ Nitride treatment

  • Easy to clean and maintain even with minimal lubrication thanks to a slick surface

  • MPI tested and shot peened bolt

  • Slicker and harder surface with 70 RC hardness

  • Great machining, fit and finish

  • Sturdy bolt (9310 steel) and carrier (8620 steel)

  • Runs flawlessly after 400 rounds of PMC and wally world ZQ ammo with zero issues

  • Every round cycles and ejects smoothly

Cons
  • Extractor cycling problems: spent more money fixing it than the initial purchase price

  • The ejector is too shallow, thus bending the ejector and spring it comes with

#7 Guntec USA AR .308 Cal Bolt Carrier Group

Guntec USA AR .308 Cal Bolt Carrier Group

View on OpticsPlanet

Specification

Color: Black
Finish: Nickel Boron
Fabric/Material: 8620 Steel
Caliber: .308 Winchester
Gun Model: AR-10

The BCG is designed for 7.62X51 / 308 Caliber and machined from 9310 Hardened Steel (Bolt) and 8620 Steel (Carrier and gas key), hardened S7 tool steel (extractor), heat-treated to H900 Condition Stainless Steel, 17-4 (Firing Pin). The Bolt assembly is supplied fully assembled with duly torqued and staked gas key.

Pros
  • HPT/MPI Tested and Marked

  • Great customer service

  • Durable Black Nickel Boron Finish

  • Function swell

Cons
  • The issue with missing parts: doesn’t include a firing pin or retainer

  • The bolt won’t cycle 7.62 x 51 NATO and part of the extractor is shearing off

  • Disappointed quality control

#8 LANTAC Enhanced Full Auto Style Bolt Carrier Group

LANTAC Enhanced Full Auto Style Bolt Carrier Group

View on OpticsPlanet

Specification

Caliber: 7.62mm Caliber, .308 Caliber
Additional Features: Full Auto Style

The DPMS Style 308 BCG (Gen 1 Pattern Only) is engineered for increased mass and lock time. The Carrier of AR10 Full-Auto Style BCG is manufactured from 8620 Steel, the Bolt is from 9310 Steel, covered with Electroless QPQ Nickel Boron with the patented, advanced UCT EXO process. The carrier’s patented and patent pending design with unique shrouded and forward-facing resized gas ports allows venting gas differently from a standard carrier, making the system cooler and cleaner. The flared boss at the tail of the carrier enhances the BCG’s position within the buffer tube at the time of cycling and makes it more consistent, resulting in smoother operation.

Pros
  • Lifetime Warranty

  • Precision Solid Bolt

  • Slick operation

  • NiB features high lubricity and corrosion resistance with a low friction coefficient (.02) and surface hardness (82-85 Rockwell C)

  • Balanced flared boss

  • Operates flatter with a smoother energy pulse with a softer start to carrier movement due to the carrier’s patented and patent pending design

  • Allows less pressurization of the upper receiver when running a suppressed barrel

  • Wear-resistant and hard-chrome lined Mil-Spec Staked gas key with hard-turned/ground critical dimensions

  • Full Auto and Semi-Auto Compatible

  • Forward Porting, Enlarged Vents

  • All Hard Chrome surfaces are to MIL-STD-171 1.2.2.2

  • Smooth Shooting

Cons
  • Mislabeled or mis-advertised (like a phosphated item being called “nitrided”)

#9 Black Rain Ordnance Bolt And Carrier Group Nickel Boron .308 Caliber

Black Rain Ordnance Bolt And Carrier Group Nickel Boron .308 Caliber
View on OpticsPlanet

Specification

Finish: NIB
Caliber: .308 Caliber
Hand: Right

The BCG is crafted from 8620 Steel with a Silver Nickel Boron finish. Black Rain Ordnance (BRO) biohazard is engraved on the spine of the carrier.

Pros
  • Quality coating

Cons
  • California’s Proposition 65

  • Not rated yet

#10 Dark Storm Industries Bolt Carrier Groups

Dark Storm Industries Bolt Carrier Groups

View on OpticsPlanet

Specification

Caliber: .308 Caliber

The DS-10 .308 Bolt Carrier Groups are compatible with most LR, SR, DPMS, CMMG, and DSI .308 in AR-10 Rifles. The BCG consists of Heat-Treated (9310) and Nickel Boron Coated Bolt, Hardened Tool Steel (S7) Extractor, and Heated-Treated Stainless Steel (17-4) Firing Pin, and Nickel Boron Coated (8620) Carrier and Gas Key.

Pros
  • MPI Inspected Bolt

  • Torqued and Staked Gas Key Hardware, Grade 8

Cons
  • Not rated yet

#11 J P ENTERPRISES – 308 AR LOW MASS BOLT CARRIER GROUP

J P ENTERPRISES - 308 AR LOW MASS BOLT CARRIER GROUP

View on Brownells

Specification

Cartridge: 308 Winchester
Finish: Black

The Bolt carrier assembly integrates a complete JP Enhanced Bolt (available separately too), installed, and staked carrier key. This reduced-weight BCG allows tame felt recoil on a Remington, JP, DPMS, or AR-style .308 rifle (LR-308 pattern only). The weight-reducing cuts on this carrier and the original JPBC-3 AR-15 bolt carrier are the same. The BCG is available with QPQ or a polished stainless finish.

Pros
  • Made in the USA

  • Suitable for shooting competition or high-heat, high-impact use

  • Helps decrease Felt Recoil on Large-Caliber AR Platform Rifles

  • Ejects smoothly and efficiently

  • Perfect fitment and machining

  • The wide carrier rails with extra bearing surfaces ensure improved bolt alignment and better wear resistance

  • The Bolt coating feels like it is lubed up

Cons
  • Not yet

#12 BROWNELLS TITANIUM BOLT CARRIER GROUP DLC

BROWNELLS TITANIUM BOLT CARRIER GROUP DLC

View on Brownells

Specification

Cartridge: 308 Winchester
Finish: DLC

The Bolt Carrier Group allows making the rifle weight lighter. The Big-Bore AR BCG for a DPMS/SR25 pattern is manufactured from Titanium, 6A1-4V (the carrier), and tool steel, 9310 (the bolt).

Pros
  • Light but still sturdy construction

  • Durable Diamond-Like Carbon (DLC) coating

  • Shots flawlessly

  • Headspaces on 18-in Faxon .308 barrel

  • Adjustable gas

  • Lightweight buffer and flat wire spring

  • Minimal muzzle jump and mitigated recoil

  • Undergoes magnetic-particle inspection

  • Cuts down on weight in any AR-Style .308 rifle

  • Fully-assembled component with a duly staked and torqued gas key, as well as a properly installed O-ring on the extractor

Cons
  • The extractor has been broken at once: after replacing it with a JP extractor and the BCG functions well

#13 CMC TRIGGERS ENHANCED BOLT CARRIER GROUP

CMC TRIGGERS ENHANCED BOLT CARRIER GROUP

View on Brownells

Specification

Cartridge: 30 Caliber (.308)
Finish: Black

The Enhanced BCG is designed with Mil-spec dimensions and external surfaces, made from case-hardened steel (8620). The AR 308 bolt assembly enhances the functionality of the short-action ARs with 7.62 NATO cartridges and related rounds.

Pros
  • Excellent fit

  • Made in the USA

  • Due to the relocated bearing surface of the carrier, firearms operate smoother and more reliable

  • The external surfaces are heat treated and CNC-ground to ensure precise tolerances

  • Low-friction, black Nitride finish

  • A flared rear assembly prevents the carrier from canting or tilting during recoil

  • Optimized for use with suppressors

  • Three forward ports make easier gas escape in the case of an overpressure round

Cons
  • Not yet

#14 ODIN WORKS INC BOLT CARRIER GROUP

ODIN WORKS INC BOLT CARRIER GROUP

View on Brownells

Specification

Cartridge: 308 Winchester
Finish: Black Nitride

This BCG is compatible with AR-10 in .243 caliber and an Aero M5 AR-10 Upper in 6.5 CM, all AR 308 rifles, including the DPMS pattern. The 308 Bolt Carrier Group is provided with a smaller diameter firing pin and firing pin hole, allowing the good performance of the high-pressure cartridges.

Pros
  • Includes firing pin and all necessary parts

  • Long-lasting Black Nitride coating

  • Treated with a low-friction

  • Designed for popular Short-Action Cartridges (.308 Win., the 6.5 Creedmoor)

Cons
  • Not yet

#15 AERO PRECISION – AR 308 BOLT CARRIER GROUP

AERO PRECISION - AR 308 BOLT CARRIER GROUP

View on Brownells

Specification

Cartridge: 30 Caliber (.308)
Finish: Phosphate

The Billet carrier is outfitted with Forward Assist serrations while the extractor (4340 steel) is equipped with double o-rings and springs. The Bolt carrier is crafted from steel (8620) and case hardened, the Bolt is from 9310 steel. The Bolt Carrier Group functions well for big-bore rifle build (.308, 6.5 Creedmoor, 7.62×51, .338).

Pros
  • Made in the USA

  • A laser engraved Aero Precision “A” logo

  • High-pressure, shot-peened, and HPT/MPI Bolt

  • Duly staked gas key, chrome lined as well as firing pin channel

  • Mil-Spec Phosphate finish

  • The AR 10 and AR 308 style builds concerning headspace seem premium: reliable fit and function of this bolt in an Aero M5 enhanced upper with a criterion barrel

Cons
  • No matter how much cleaning/oiling, the bolt gets stuck in the carrier: it is excessively tight when it should move smoothly and without much effort

  • Consistent light strikes/FTF, as the firing pin is more than 1/32in too short

#16 CMMG – 308 AR BOLT CARRIER GROUP

CMMG - 308 AR BOLT CARRIER GROUP

View on Brownells

Specification

Cartridge: 308 Winchester
Finish: Matte Black

The complete bolt/carrier group is designed for AR-style .308 rifles. The carrier is without forwarding assist serrations and features a sturdy phosphate finish and chrome-lined interior. The BCG includes an extractor, gas key (torqued to spec and properly staked), firing pin, cam pin, and firing pin retaining pin.

Pros
  • Made in the USA

  • Heavy-Duty Construction

  • Locks up tight with no rattles anywhere

  • Feeds and ejects flawlessly

  • The first-rate materials (8620 steel, 9310 hardened steel, hardened S7 tool steel)

Cons
  • Not yet

Conclusion

There are many different types of .308 BCGs on the market, and it can be difficult to determine which is the best for your needs. In this article, we’ve provided a review of popular models. After updating your rifle with Mil-Spec .308 Complete Bolt Carrier Group, you’ll get a reliable and permanently smooth cycle. Hopefully, this information will help you choose the right one for your needs.

Tags: #best 308 bcg / #best .308 bcg for the money / #best bcg for 308 / #best .308 bcg / #best ar 308 bcg

0 0 votes
Article Rating
Subscribe
Notify of
0 Comments
Inline Feedbacks
View all comments