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bolt carrier

A bolt is the part of a repeating, breech-loading firearm that blocks the rear opening (breech) of the barrel chamber while the propellant burns, and moves back and forward to facilitate loading/unloading of cartridges from the magazine. The extractor and firing pin are often integral parts of the bolt.
In gas-operated firearms, the bolt itself is housed within the larger bolt carrier group (BCG), which contains additional parts that receives rearward push from the gas piston.
The slide of a semi-automatic pistol is a form of bolt, as it contains the same parts and serves the same functions.

View More On Wikipedia.org
Recent contents
  1. N

    AR-10 Bolt Carrier

    Who's making the favored AR-10 Bolt Carrier these days?
  2. eldbillbo

    AR-10 SR-25 LR-308 Parts, Receivers, Barrels, Bolt Carrier groups

      1. For Sale
    • Oregon City
    • Oregon
    No Shipping unless it's a trade. Trades considered LR-308 Bolt carrier Group #1 New 125 LR308 Upper Receivers $125 AR10 Spikes Upper receiver this takes the higher profile Railed handguard if that is what you are using it with $80 I also have a charging handle for $15 with purchase of...
  3. ar man

    Cetme bolt

      1. Want to Buy
      2. Want to Trade For
    • Keizer
    • Oregon
    I am looking to see if any one local has a Cetme g3 or hk91 bolt and carrier available that they would want to sale. Mainly need just the bolt before I order one. Have cash or trade
  4. af306

    Spikes Tactical Nickel Boron Bolt Carrier Group $150 OBO shipped

      1. For Sale
    • $150
    • Lake Oswego
    • Oregon
    New Spike's Tactical Bolt Carrier Group, Nickel Boron coated. New, never used. In box. Paid $225 new $150 OBO sincludes tracked and insured shipping
  5. Mark_Dorman

    WTB: Used/Old AR-15 Bolt Carrier

      1. Want to Buy
    • PORTLAND
    • Oregon
    Looking for a used/cheap AR-15 Bolt Carrier. I have a Magpul BEV Block that I use for gun building. I get annoyed having to disassemble one of my BCGs to anchor the upper so I was hoping to pick up a beat-up old one that someone doesn't really want or need just to use as an insert. I can get a...
  6. .45's and .38's

    Aero nitride 556 bolt carrier new

      1. For Sale
      2. For Trade
    • $80
    • Portland
    • Oregon
    Brand new never used $80 or trade Pickup Gresham
  7. CameronLochiel

    LWRCi & Colt BCG's

      1. For Sale
    • $100
    • Lyons
    • Oregon
    LWRCi DI BCG, Used, Sub 500 Rounds - $200 *SOLD* Colt BCG's, Used, Unknown Round Count, $100 per Colt BCG #2 needs new gas rings for its bolt. Additional photos provided upon request.
  8. .45's and .38's

    Colt bolt carrier group

      1. For Sale
      2. For Trade
    • $180
    • Portland
    • Oregon
    Selling for what I paid never used $180 Gresham no holds
  9. O

    Bolt Carrier groups - Aero

      1. For Sale
    • puyallup
    • Washington
    I have some new Aero bcgs up for sale Aero 308 bcg nickel boron - https://www.aeroprecisionusa.com/308-bolt-carrier-group-nib Aero ar15 bcg nickel boron - https://www.aeroprecisionusa.com/ar15-556-bolt-carrier-group-nib Aero ar15 bcg nitride -...
  10. .45's and .38's

    New Aero 308 bolt carrier group

      1. For Sale
      2. For Trade
    • $170
    • Portland
    • Oregon
    Brand new black nitride For AR10 308 caliber Price drop to $170 it’s brand new $200 and I’ll toss in the 308 BCM charging handle
  11. J

    Adams arms with upgraded bolt carrier group and trigger. 3x9 Redfield BDC Plus 3 mags

      1. For Sale
    • $1400
    • KALAMA
    • Washington
    In very good condition about 100 rounds down the tube
  12. Siglvr

    Wilson Combat Hard Chromed AR-15/M16 Bolt Carrier Group Complete Blem - $99.98

    I bought the non-hard chrome version of one of these a few years back and wasn't impressed by Wilson's much touted and vaunted quality. The unit worked fine, but it had machining marks as if they didn't finish it or it was someones first day on the job...
  13. JRummel

    Complete radical firearms 16'' keymod upper New never fired with new Grey cerakoted bolt carrier and Kineti tech brake and sleeve

      1. For Sale
    • $200
    • Marysville
    • Washington
    Clearing out one of the safes, and I had a couple uppers I never did anything with. This one is a 16'' radical firearms Keymod, so you know its been in there a while lol. I never shot it though, just racked the bolt to chamber check whenever I took it out of the safe. The Kineti-tech is just...
  14. O

    Colt bolt carrier group

      1. For Sale
    • puyallup
    • Washington
    I have a Colt BCG that was pulled from an Colt LE6920 back when Colt made good stuff. used it in my 7.5" has C markings. cant see anything on the bolt as far as markings. at least a few hundred rounds on it. 175.00 meet in puyallup
  15. huntpotter

    Rise Armament Bolt Carrier Group

      1. For Sale
    • $100
    • Vancouver Ridgefield
    • Washington
    Up for sale. SW WA, Vancouver area, Clark County area. Rise Armament, AR-15 Bolt Carrier Group. 9310 MPI bolt, Nitride, M16 profile, Tool steel, shot peened extractor. High quality BCG. New in package. (Retails for $169)...
  16. huntpotter

    AR Bolt Carrier Group Lower Parts Kit

      1. For Sale
    • $150
    • Vancouver Ridgefield
    • Washington
    Up for sale, Southwest Washington, Vancouver area, Clark county area. AR-15 parts bundle. All brand new, never used. All for $150 cash. Rise Armament Bolt Carrier Group. 5.56. Nitride. 9310 MPI M16 profile. (Retails for $169) Rise Armament lower parts kit. AR-15. (Retails for $32) CMMG...
  17. huntpotter

    AR 5.56 Barrel / Mlok Handguard / Bolt Carrier Group Charging Handle

      1. For Sale
    • $80
    • Vancouver Ridgefield
    • Washington
    Up for sale. SW WA. Vancouver area. Clark County area. AR Parts. Individual, or as a package deal. PSA 5.56 barrel. 16”, midlength, nitride. Dimpled gas block spot. New, unfired. $80 cash. Battle Arms Development 13” Mlok handguard. As new. With barrel nut and hardware. Includes a new Magpul...
  18. CameronLochiel

    LWRC i Complete BCG

      1. For Sale
    • $250
    • Lyons
    • Oregon
    Used in good condition. $280 Pickup, $300 Shipped.
  19. B

    Unfired factory built complete upper Aero Precision M4E1 Atlas R-One 12.5" 556 NATO - no bolt carrier group no ch

      1. For Sale
    • $300
    • Seattle
    • Washington
    Unfired factory built complete upper Aero Precision M4E1 Atlas R-One 12.5" 556 NATO - No BCG No charging handle Meet in Seattle area $300 FIRM - contact [email protected] for faster response
  20. C

    >> SALE PENDING << Rubber City bolt carrier / Fail Zero Nb bolt & Fortis "HAMMER" CH ~ Smok'n deal @ $100 dollars

      1. For Sale
    • $100
    • Hillsboro
    • Oregon
    Selling some items to recover auto repairs.. these items are my spare / next build / whatever you want to call them items No onto the post ~ Rubber City Armory nitride 223 / 556 (FA profile) bolt carrier w/ Fail Zero Nb bolt, Nb cam pin and Nb firing pin * Nb ='s NICKEL BORON Bolt has about...
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