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Bolt Carrier Groups

Bolt Carrier Groups

The Bolt Carrier Group is the heart of your firearm, and is responsible for housing the bolt and resetting the hammer, as well as bearing the majority of the gas pressure with each shot. Having a quality bolt carrier is crucial for a smooth, reliable operation, and differences in weight, platings, coatings, and even firing-pin hole size change how your gun fires. Check out the different BCG configurations. Make sure you're getting the best performance from your firearm with the best bolt carrier groups offered by ACME Machine.

  • Spike's 9mm Bolt Black RPVSPKST9BG01

    Spike's 9mm Bolt Black

    MSRP: $199.95
    Your Price: $179.95
    The Spikes Tactical 9mm Enhanced Bolt can be used with both Glock and Colt pattern lowers.Features : Blow Back Design Black Nitride Finish Laser Engraved with ST Spider Logo
    MSRP: $199.95
    Your Price: $179.95
  • Out of stock
    NEW
    CMMG 4.5"  .22 LR Barrel & BCG Kit

    CMMG 4.5" .22 LR Barrel & BCG Kit

    Your Price: $294.99
    CMMG 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 Taper Profile 4140 Chrome Moly Salt Bath Nitride...
    Your Price: $294.99
  • Out of stock
    NEW
    5.7 x 28mm CMMG Barrel and BCG Kit, 5″ 416SS, SBN

    5.7 x 28mm CMMG Barrel and BCG Kit, 5″ 416SS, SBN

    Your Price: $399.99
    CMMG 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 direct blowback systems, Radial Delayed...
    Your Price: $399.99
  • Out of stock
    NEW
    5.7 x 28mm CMMG Barrel and BCG Kit, 8″ 416SS, SBN

    5.7 x 28mm CMMG Barrel and BCG Kit, 8″ 416SS, SBN

    Your Price: $439.99
    CMMG 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 direct blowback systems, Radial Delayed Blowback...
    Your Price: $439.99
  • Out of stock
    NEW
    5.7 x 28mm CMMG Barrel and BCG Kit, 16.1″ 416SS, SBN

    5.7 x 28mm CMMG Barrel and BCG Kit, 16.1″ 416SS, SBN

    Your Price: $449.99
    CMMG 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 direct blowback systems, Radial Delayed...
    Your Price: $449.99
  • CMMG Bolt Assembly, Mk9, w/ Glock Cut RPVCMMG90BA46A_1

    CMMG Bolt Assembly, Mk9, w/ Glock Cut

    Your Price: $224.95
    This 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.Features : Modified to Accept Glock Pattern Magazines...
    Your Price: $224.95
  • Out of stock
    CMMG 22LR AR Conversion Kit, Bravo , 25 Rd

    CMMG 22LR AR Conversion Kit, Bravo , 25 Rd

    Your Price: $199.95
    Just swap this drop in conversion with the bolt carrier group from your 5.56/.223 chambered rifle and you will be ready to shoot .22LR.  Ships with 25rd 22LR magazine.  For best performance use a round style hammer as notched hammers can cause...
    Your Price: $199.95
  • Out of stock
    CMMG 22LR AR Conversion Kit, Bravo, w/ 3 10rd Magazines

    CMMG 22LR AR Conversion Kit, Bravo, w/ 3 10rd Magazines

    Your Price: $229.95
    Just swap this drop in conversion with the bolt carrier group from your 5.56/.223 chambered rifle and you will be ready to shoot .22LR. Ships with 3 10rd magazines.  For best performance use a round style hammer as notched hammers can cause function...
    Your Price: $229.95
  • Out of stock
    CMMG 22LR AR Conversion Kit, Bravo, w/3  25 Rd Magazines

    CMMG 22LR AR Conversion Kit, Bravo, w/3 25 Rd Magazines

    Your Price: $229.95
    Just swap this drop in conversion with the bolt carrier group from your 5.56/.223 chambered rifle and you will be ready to shoot .22LR. Ships with 3 25rd magazines.  For best performance use a round style hammer as notched hammers can cause function...
    Your Price: $229.95
  • Out of stock
    CMMG 22LR AR Conversion Kit, Bravo, 10rd

    CMMG 22LR AR Conversion Kit, Bravo, 10rd

    Your Price: $199.95
    Just swap this drop in conversion with the bolt carrier group from your 5.56/.223 chambered rifle and you will be ready to shoot .22LR. Ships with a 10rd Magazine.  For best performance use a round style hammer as notched hammers can cause...
    Your Price: $199.95
  • Out of stock
    NEW
    CMMG 16.1"  M4 .22 LR Barrel & BCG Kit 22D7C6C

    CMMG 16.1" M4 .22 LR Barrel & BCG Kit 22D7C6C

    Your Price: $339.99
    CMMG 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 Specifications:Manufacturer Number: 22D7C6C16.1"M4...
    Your Price: $339.99
  • Out of stock
    On Sale
    Toolcraft 458 / 450 Mil-Spec Bolt Carrier Group AR-15 Nitride

    Toolcraft 458 / 450 Mil-Spec Bolt Carrier Group AR-15 Nitride

    MSRP: $149.99
    Now: $119.99
    Was: $149.99
    This 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 finished in a self-lubricating polished black nitride. Bolt...
    MSRP: $149.99
    Now: $119.99
    Was: $149.99