Bolt Carrier Groups
The bolt carrier group (BCG) is the heart of your AR. It feeds, locks, fires and extracts every round. ACME BCGs are made in the USA to ACME's specifications, with C158 steel bolts in nitride, nickel boron, DLC and titanium nitride finishes, for AR-15 and AR-10. Every ACME BCG is backed by our lifetime warranty for the life of the product. We also carry Toolcraft, CMMG, Breek Arms and Odin Works.
Which finish is right for you?
| Finish | Why choose it |
|---|---|
| Nitride | Tough, corrosion resistant and affordable. The best all-around choice. |
| Nickel boron (NiB) | Slick and easy to clean. Carbon wipes right off. |
| DLC | Very hard, low-friction coating that runs well with less lube. |
| Titanium nitride (gold) | Hard, slick finish with a gold look. |
Mil-spec, enhanced or M16?
- Mil-spec: the standard AR-15 carrier. Works in any AR-15.
- Enhanced: improved extraction and finish for heavy use and suppressed shooting.
- M16 profile: a heavier carrier for smoother cycling, especially with 300 Blackout and suppressors. It's legal in semi-auto rifles.
Questions
Will this BCG work with 300 Blackout?
Yes. 5.56 bolt carrier groups also run 300 Blackout, because both use the same bolt face.
Do I need to check headspace with a new BCG?
We recommend it any time you pair a new bolt with a barrel. A go/no-go gauge takes a minute.
Where are ACME bolt carrier groups made?
In the USA. ACME bolt carrier groups are made for us by a US manufacturer to ACME's specifications, then inspected and backed by ACME.
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NEW
5.7 x 28mm CMMG Barrel and BCG Kit, 16.1″ 416SS, SBN
CMMG
Price: $449.99CMMG Barrel and Bolt Group Kit, 16.1" 5.7x28mm The 5.7x28mm Barrel and BCG Kit allows you to build an AR in 5.7x28mm using CMMG’s patented Radial Delayed Blowback operating system. Unlike typical...Price: $449.99Qty in Cart: 0Quantity:Price:Price: $449.99Subtotal: -
NEW
5.7 x 28mm CMMG Barrel and BCG Kit, 8" 416SS, SBN
CMMG
Price: $439.99CMMG Barrel and Bolt Group Kit, 8" 5.7x28mm The 5.7x28mm Barrel and BCG Kit allows you to build an AR in 5.7x28mm using CMMG’s patented Radial Delayed Blowback operating system. Unlike typical...Price: $439.99 -
NEW
5.7 x 28mm CMMG Barrel and BCG Kit, 5″ 416SS, SBN
CMMG
Price: $399.99CMMG Barrel and Bolt Group Kit, 16.1" 5.7x28mm The 5.7x28mm Barrel and BCG Kit allows you to build an AR in 5.7x28mm using CMMG’s patented Radial Delayed Blowback operating system. Unlike typical...Price: $399.99 -
NEW
CMMG 16.1" M4 .22 LR Barrel & BCG Kit 22D7C6C
CMMG
Price: $339.99CMMG Barrel and Bolt Group Kit, 16.1" M4, 22 Long RifleEverything you need to convert your existing upper to a dedicated .22LR. Just purchase a magazine and you are ready to go.Features and...Price: $339.99Qty in Cart: 0Quantity:Price:Price: $339.99Subtotal: -
NEW
CMMG 4.5" .22 LR Barrel & BCG Kit
CMMG
Price: $294.99CMMG Barrel and Bolt Group Kit, 4.5" 22 Long RifleEverything you need to convert your existing upper to a dedicated .22LR. Just purchase a magazine and you are ready to go.4.5″ Medium TPrice: $294.99Qty in Cart: 0Quantity:Price:Price: $294.99Subtotal: -
Breek Arms Warhammer Mod 2 & AR-15 Nitride BCG & Upper Receiver Combo
Breek Arms
Price: $259.99The Breek Arms WARHAMMER MOD2 ambi charging handle is a simple and affordable upgrade that will substantially increase the use of your AR-15. Easily grab on either side of the handle and you can...Price: $259.99 -
Breek Arms Warhammer 2.0 & AR-15 Nitride BCG & 16" 5.56 Barrel M4 Profile
Breek Arms
Price: $249.99The Breek Arms WARHAMMER MOD2 ambi charging handle is a simple and affordable upgrade that will substantially increase the use of your AR-15. Easily grab on either side of the handle and you can...Price: $249.99 -
CMMG Bolt Assembly, Mk9, w/ Glock Cut
CMMG
Price: $224.95This Mk9 Blowback Bolt assembly has been modified to operate with Glock Magazines in addition to the traditional Colt style 9mm Magazines. This bolt does NOT work with CMMG GUARD or Banshee models...Price: $224.95Qty in Cart: 0Quantity:Price:Price: $224.95Subtotal: -
AR-15 5.56 Nitride Bolt Carrier Group C158 & Assembled Upper Receiver Combo
ACME Machine
Price: $219.99This bolt carrier is manufactured from case hardened 8620 steel with properly staked 4130 steel gas key. The accompanying bolt is Carpenter 158, shot peened, HPT and MPI tested, and finished in a...Price: $219.99 -
ACME-X Adamantium 5.56 Enhanced Bolt Carrier Group M-16
ACME Machine
Price: $179.99ACME-X Adamantium plating provides a higher hardness, significantly improving performance. A harder surface greatly reduces the coefficient of friction and the adhesive force, resulting in lower wear...Price: $179.99Qty in Cart: 0Quantity:Price:Price: $179.99Subtotal: -
Breek Arms Warhammer Mod 2 & AR-15 Nitride 5.56 Bolt Carrier Group C158 Combo
Breek Arms
Price: $179.99The Breek Arms WARHAMMER MOD2 ambi charging handle is a simple and affordable upgrade that will substantially increase the use of your AR-15. Easily grab on either side of the handle and you can...Price: $179.99 -
Spike's 9mm Bolt Blk
Spike's Tactical
MSRP: $199.95Price: $179.99The Spikes Tactical 9mm Enhanced Bolt can be used with both Glock and Colt pattern lowers.Features :Blow Back DesignBlack Nitride FinishLaser Engraved with ST Spider LogoMSRP: $199.95Price: $179.99Qty in Cart: 0Quantity:Price:MSRP: $199.95Price: $179.99Subtotal: -
On Sale
16" 300 Blackout Barrel, BCG & Gas Block/Tube Combo Special
ACME Machine
MSRP: $310.99Now: $169.99Was: $310.99ACME Machine 5.56 Mil-Spec Bolt Carrier Group AR-15 Nitride C158 Bear Creek Arsenal 16" 300 Blackout Parkerized HB, 1:8 TwistMSRP: $310.99Now: $169.99Was: $310.99Qty in Cart: 0Quantity:Price:MSRP: $310.99Now: $169.99Was: $310.99Subtotal:
Toolcraft AR-308 BCG Nickel Boron Bolt Carrier Group
Toolcraft
MSRP: $249.99Price: $169.99Toolcraft BCG Nickel Boron AR308 Auto Bolt Carrier Group 9310 Alloy Steel MPI Tested All manufacturing and coating is done by Toolcraft. 100% Made in USA and includes Lifetime Warranty from Toolcraft...MSRP: $249.99Price: $169.99Qty in Cart: 0Quantity:Price:MSRP: $249.99Price: $169.99Subtotal:
Toolcraft 5.56 Bolt Carrier Group AR-15 Nickel Boron C158
Toolcraft
MSRP: $179.99Price: $149.99Toolcraft BCG Nickel Boron AR15 / M16 Auto Bolt Carrier Group 9310 MPI Tested All manufacturing and coating is done by Toolcraft. 100% Made in USA and includes Lifetime Warranty from Toolcraft. If...MSRP: $179.99Price: $149.99
Toolcraft 9mm Mil-Spec Bolt Carrier Group Nitride - Glock
Toolcraft
MSRP: $169.99Price: $149.99AR-15 Bolt Carrier Group is specifically designed for use in pistol-caliber carbines, which are a growing trend in the AR-15 world. This bolt-carrier group allows AR builders to custom-make their own...MSRP: $169.99Price: $149.99
Toolcraft AR-308 BCG Nitride Bolt Carrier Group
Toolcraft
MSRP: $219.99Price: $149.99Toolcraft BCG Nickel Boron AR308 Auto Bolt Carrier Group 9310 Alloy Steel MPI Tested All manufacturing and coating is done by Toolcraft. 100% Made in USA and includes Lifetime Warranty from Toolcraft...MSRP: $219.99Price: $149.99Qty in Cart: 0Quantity:Price:MSRP: $219.99Price: $149.99Subtotal:
Odin 6.5 Grendel Type 2 Nit Bcg Blk
Odin Works
MSRP: $149.00Price: $141.996.5 Grendel Type 2 bolt face - Black Nitride Bolt Carrier Group.Features :Type 2 6.5 Grendel bolt faceMaterial: Case Hardened 8620 SteelBolt Material: Case Hardened 9310 SteelFinish: All Bolt...MSRP: $149.00Price: $141.99Qty in Cart: 0Quantity:Price:MSRP: $149.00Price: $141.99Subtotal:
ACME 5.56 Enhanced Bolt Carrier Group AR-15 Nitride
ACME Machine
Price: $139.99The enhanced bolt carrier is designed to reduce carrier tilt/cant during recoil and increasing reliability by strategically relocating key bearing surfaces. The enhanced...Price: $139.99Qty in Cart: 0Quantity:Price:Price: $139.99Subtotal:
ACME AR-308 / AR-10 Mil-Spec 7.62 Complete Bolt Carrier Group Nickel Boron
ACME Machine
MSRP: $189.99Price: $139.99Get a high quality Bolt Carrier Group for your AR with this superb .308/7.62 Nickel Boron BCG from ACME Machine ! This .308/7.62 Nickel Boron BCG with Forward Assist features an 8620 Tool Steel...MSRP: $189.99Price: $139.99