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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Toolcraft 458 / 450 Mil-Spec Bolt Carrier Group AR-15 Nitride
Toolcraft
MSRP: $149.99Price: $139.99This bolt carrier is manufactured from case hardened 8620 steel with properly staked 4130 steel gas key. The accompanying bolt is case hardened 9310 steel, shot peened, HPT and MPI tested, and...MSRP: $149.99Price: $139.99 -
Toolcraft 6.8 Mil-Spec Bolt Carrier Group AR-15 Nitride
Toolcraft
MSRP: $149.99Price: $139.99This bolt carrier is manufactured from case hardened 8620 steel with properly staked 4130 steel gas key. The accompanying bolt is case hardened 9310 steel, shot peened, HPT and MPI tested, and...MSRP: $149.99Price: $139.99 -
Toolcraft 7.62x39 Mil-Spec Bolt Carrier Group AR-15 Nitride
Toolcraft
MSRP: $149.99Price: $139.99This bolt carrier is manufactured from case hardened 8620 steel with properly staked 4130 steel gas key. The accompanying bolt is case hardened 9310 steel, shot peened, HPT and MPI tested, and...MSRP: $149.99Price: $139.99 -
ACME 5.56 Bolt Carrier Group AR-15 Nickel Boron C158
ACME Machine
MSRP: $169.99Price: $129.99ACME Machine has been in business since 1976 crafting highly precise components. All ACME BCG parts are of the highest quality and 100% made in America. ACME has taken their line of precision AR...MSRP: $169.99Price: $129.99 -
ACME AR-308 / AR-10 Mil-Spec 7.62 Complete Bolt Carrier Group Nitride
ACME Machine
MSRP: $169.99Price: $129.99The enhanced bolt carrier is designed to reduce carrier tilt/cant during recoil and increasing reliability by strategically relocating key bearing surfaces. The enhanced...MSRP: $169.99Price: $129.99 -
Odin 223 Nitride Bcg Black
Odin Works
MSRP: $129.00Price: $122.99Bolt Carrier Group fits AR15/M4 compatible style Rifles (i.e.) .223/5.56mm" .300 Blackout.Features :Mil-Spec dimensionsBolt Carrier Group Material: Case Hardened 8620Bolt Material: Case Hardened 9310...MSRP: $129.00Price: $122.99Qty in Cart: 0Quantity:Price:MSRP: $129.00Price: $122.99Subtotal: -
Toolcraft 5.56 Mil-Spec Bolt Carrier Group AR-15 Nitride C158
Toolcraft
MSRP: $139.99Price: $119.99This bolt carrier is manufactured from case hardened 8620 steel with properly staked 4130 steel gas key. The accompanying bolt is case hardened 9310 steel, shot peened, HPT and MPI tested, and...MSRP: $139.99Price: $119.99 -
Toolcraft 5.56 Mil-Spec Bolt Carrier Group AR-15 Phosphate C158
Toolcraft
MSRP: $139.99Price: $119.99This bolt carrier is manufactured from case hardened 8620 steel with properly staked 4130 steel gas key. The accompanying bolt is case hardened 9310 steel, shot peened, HPT and MPI tested, and...MSRP: $139.99Price: $119.99Qty in Cart: 0Quantity:Price:MSRP: $139.99Price: $119.99Subtotal: -
ACME 5.56 Mil-Spec Bolt Carrier Group AR-15 Nitride C158
ACME Machine
MSRP: $139.99Price: $119.00This 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...MSRP: $139.99Price: $119.00 -
On Sale
5.56 Mil-Spec Bolt Carrier Group AR-15 DLC Finish
ACME Machine
MSRP: $149.99Now: $99.99Was: $149.99The DLC coating on these BCGs is unique in that it changes color depending on the presence of oil and other liquids. It can vary from bright blue to a light lavender color. 8620 M16 style carrier...MSRP: $149.99Now: $99.99Was: $149.99Qty in Cart: 0Quantity:Price:MSRP: $149.99Now: $99.99Was: $149.99Subtotal: -
On Sale
5.56 Mil-Spec Bolt Carrier Group AR-15 Titanium Nitride
ACME Machine
MSRP: $129.99Now: $99.99Was: $129.99TiN M16 Bolt Carrier Group . Incredibly stunning look, thanks to the bright gold titanium-nitride finish used on the surface of the carrier and bolt. The carrier is made using 8620 tool steel,...MSRP: $129.99Now: $99.99Was: $129.99 -
On Sale
Toolcraft 6.5 Grendel Type 2 Mil-Spec Bolt Carrier Group AR-15 Nitride
Toolcraft
MSRP: $149.99Now: $99.99Was: $139.99This bolt carrier is manufactured from case hardened 8620 steel with properly staked 4130 steel gas key. The accompanying bolt is case hardened 9310 steel, shot peened, HPT and MPI tested, and...MSRP: $149.99Now: $99.99Was: $139.99 -
On Sale
AR15 6.8 / .224 Valkyrie Bolt Assembly
ACME Machine
MSRP: $69.99Now: $39.99Was: $69.996.8 / .224 Valkyrie MPI Tested Black Nitride Bolt Head with Phosphate Extractor offers a 9310 Steel MPI Tested 6.8 SPC bolt with Nitride finish that will not flake off, and produces less friction...MSRP: $69.99Now: $39.99Was: $69.99