Bolt Carrier Group

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The AR-15 bolt carrier group (BCG) is the heart of the rifle: it strips a round from the magazine, chambers it, locks, fires and extracts. Look for a properly staked gas key, a shot-peened, magnetic-particle-inspected bolt, and a durable finish; phosphate, nitride, nickel boron and DLC all work. The bolt face must match your caliber: a standard 5.56 bolt also runs 300 Blackout, while 6.5 Grendel, 7.62x39 and .308 need their own.

Compare BCGs across stores below, and MyGunLab will flag a bolt that doesn't match your barrel.

Read our guide: How to Build an AR-15: Parts List, Tools & Steps

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Product	Caliber	Finish	Platform	Material	Best price
JP Enterprises LARGE FRAME LMOS Stainless Bolt Carrier Group w/ High Pressure .308 BoltJP EnterprisesAR-10	—	—	AR-10	—	$479.752 storesIn stockSale
JP Enterprises LARGE FRAME VMOS Bolt Carrier Group w/ 2 Tungten and High Pressure .308 BoltJP EnterprisesAR-10	—	—	AR-10	—	$612.751 storeIn stockSale
Rainier Arms AR-15 Precision Match Grade BCG - NitrideRainier ArmsNitride · AR-15	—	Nitride	AR-15	—	$149.951 storeIn stockSale
Faxon 9MM Glock/Colt Complete Bolt Carrier Group GEN 2 - NitrideFaxon Firearms9mm · AR-9	9mm	—	AR-9	—	$152.007 storesIn stockSale
V Seven AR-15 TITANIUM BCG COMPLETE IONBOND FINISHV Seven Weapon SystemsAR-15	—	—	AR-15	—	$484.031 storeIn stockSale
LANTAC .308/7.62X51MM Enhanced Full Auto Style Bolt Carrier Group NiB CoatedLantacAR-10	—	—	AR-10	—	$316.996 storesIn stock
Ar15A4 Bolt AssemblyColtAR-15	—	—	AR-15	—	$103.992 storesIn stock
Faxon Gunner BCG Ultra-Light Bolt Carrier GroupsFaxon Firearms	—	—	—	—	$229.088 storesIn stock
JP Enterprises 9mm bolt assemblyJP Enterprises9mm · AR-9	9mm	—	AR-9	—	$259.301 storeIn stockSale
JP Enterprises Full Mass Operating Sys. Carrier GrP/ w High Pressure .308 Enhanced BoltJP EnterprisesAR-10	—	—	AR-10	—	$479.754 storesIn stock
JP Enterprises Ultra Low Mass Operating SystemJP Enterprises	—	—	—	—	$460.751 storeIn stockSale
LANTAC E-BCGLantac5.56 mm NATO · Nickel Boron · AR-15	5.56 mm NATO	Nickel Boron	AR-15	—	$269.996 storesIn stockSale
JPBC-3A Low-Mass Bolt & CarrierJP EnterprisesAR-15	—	—	AR-15	—	$356.253 storesIn stockSale
Complete Bolt/Carrier Group, M16Daniel DefenseAR-15	—	—	AR-15	—	$247.006 storesIn stock
5.56 Bolt AssemblyDaniel Defense5.56 mm NATO · AR-15	5.56 mm NATO	—	AR-15	—	$87.005 storesIn stock
JPBC-2A Full-Mass Bolt & CarrierJP EnterprisesAR-15	—	—	AR-15	—	$356.255 storesIn stock
AR15 223 Bolt Completion GroupJP EnterprisesAR-15	—	—	AR-15	—	$126.995 storesIn stock
Lantac ENHANCED NIB BCG 223/556 SIDE CHARGERLantac.223 / 5.56 · AR-15	.223 / 5.56	—	AR-15	—	$289.993 storesIn stock
.223/5.56 Bolt/Carrier, Nickel-BoronSpikes Tactical5.56 mm NATO · AR-15	5.56 mm NATO	—	AR-15	—	$202.506 storesIn stockSale
.223/5.56 Bolt/Carrier, Phosphate FinishSpikes Tactical5.56 mm NATO · AR-15	5.56 mm NATO	—	AR-15	—	$134.966 storesIn stockSale
308 AR Titanium Bolt Carrier Group 308 Win DLC MPBrownellsAR-10	—	—	AR-10	—	$239.991 storeIn stockSale
AR-15 Bolt Carrier Group Adjustable2A ArmamentAR-15	—	—	AR-15	—	$312.991 storeIn stock
AR-15 9mm Bolt Carrier Group BlackAngstadt ArmsAR-9	—	—	AR-9	—	$159.007 storesIn stockSale
Cryptic Coatings Mystic Black Complete Bolt Carrier Group with Carpenter 158 HPT/MPI Tested Bolt	—	—	—	—	$238.992 storesIn stockSale
Cryptic Coatings Mystic Gold Complete Bolt Carrier Group with Carpenter 158 HPT/MPI Tested Bolt	—	—	—	—	$217.992 storesIn stockSale
Cryptic Coatings Mystic Bronze Complete Bolt Carrier Group with Carpenter 158 HPT/MPI Tested Bolt	—	—	—	—	$217.992 storesIn stockSale
Faxon 6.5 Grendel Bolt Carrier Group, Nitride - FF65GBCGCNITRIDEFaxon FirearmsAR-15	—	—	AR-15	—	$151.808 storesIn stock
Faxon 6.5 Grendel Bolt, 9310, Nitride - FF65GBCNITRIDEFaxon FirearmsAR-15	—	—	AR-15	—	$70.007 storesIn stockSale
.223 EnhancedboltJP EnterprisesAR-15	—	—	AR-15	—	$125.354 storesIn stock
9mm Complete Bolt BlackStern DefenseAR-9	—	—	AR-9	—	$129.994 storesIn stock

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Bolt Carrier Group: common questions

Full-auto or semi-auto profile carrier?

A full-auto (M16) profile carrier is heavier at the back, which smooths recoil and helps reliability, and it's legal in a semi-auto rifle. Semi-auto profile carriers are lighter, cut away at the rear.

Can I use a 5.56 BCG in a 300 Blackout?

Yes. 300 Blackout uses the same bolt face as 5.56, so a standard AR-15 BCG works; only the barrel, and sometimes the magazines, are different.

Should I check headspace with a new bolt?

It's good practice to check headspace with go/no-go gauges whenever you pair a new bolt with a barrel, especially from different makers.

Which BCG finish is best?

Phosphate is the mil-spec standard; nitride is slicker and resists corrosion; nickel boron and DLC are the easiest to clean. All of them run well with lubrication.