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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. T

    LMT - CMMG - SHARPS - V SEVEN - DARK HOUR - MEGA ARMS/ZEV - YOUNG MANUFACTURING

      1. For Sale
    • $100
    • PORTLAND
    • Oregon
    FOR SALE ARE ALL BRAND NEW AND NEVER USED UPPER RECEIVERS AND BOLT CARRIERS. OPEN TO OFFERS. 1) LMT BCG 556/223 L7D3 ……. $325 2) YOUNG BOLT CARRIER W/ RUBBER CITY ADJUSTABLE GAS KEY NO BOLT………….$200 3) SHARPS BROS RECEIVER SBUR03…$150 4) V SEVEN M4 RECEIVER……….$145 5) CMMG MK4...
  2. RobMa

    - SOLD -Two brand new BCM Bolt carrier groups for sale, no tax and free shipping "BCM® Bolt Carrier Group (MPI) - SOLD -

      1. For Sale
    • $200
    • Seattle
    • Washington
    Sorry these items are sold Two brand new BCM Bolt carrier groups for sale, no tax and free shipping One sold, only one left! Blurb from page: BCM® (MPI) complete bolt carrier group is fully assembled. (BCG) Bolt carrier group (auto version) for your AR15, M16, or M4. Parkerized exterior and...
  3. pnwhunter69

    PSA bolt carrier group, brand new!

      1. For Sale
    • $100
    • Molalla/Oregon city
    • Oregon
    PSA bolt carrier group, brand new. I purchased this for a new build but went with another bcg $100 cash, no trades. I can ship for $8.45 priority, next day shipping.
  4. Asavage270

    Brownells Light Weight Bolt Carrier Group Nickel Boron

      1. For Sale
      2. For Trade
    • $170
    • Eugene
    • Oregon
    Looking to sell my Brownells light weight BCG, Nickel Boron coated Installed this in a new build and put about 40-60 rounds through it with a JP Silent Capture spring and an adjustable gas block. Really smooth shooting combo but my girl bought me a Cryptic Coatings BCG for my bday so I threw...
  5. RobMa

    Brand new BCM Bolt Carrier Group (MPI) - Auto

      1. For Sale
    • $175
    • Seattle
    • Washington
    Brand new BCM Bolt Carrier Group (MPI) - Auto Never used, only kept in safe A great addition to your build. Oil = dust :rolleyes: I take PayPal friends and family Shipping OK, S/H 4.99 No separate parts purchase requests please. No trade requests please. No face-to-face sales requests please
  6. arakboss

    AO Precision True Mil-Spec SP/HPT/MPI 5.56 Bolt Carrier Group

    https://ar15discounts.com/products/ao-precision-true-mil-spec-sp-hpt-mpi-5-56-bolt-carrier-group/
  7. pnwhunter69

    Geissele REBCG bolt carrier group, brand new!

      1. For Sale
    • $350
    • Molalla
    • Oregon
    Brand new Geissele REBCG bolt carrier group. Reliability enhanced bolt carrier group from a new Geissele super duty rifle. $350 cash, no trades in Molalla, OR
  8. eldbillbo

    COLT SP1 CMP CHROME BORE BARREL

      1. For Sale
    • $450
    • Oregon City
    • Oregon
    CASH ONLY COLT SP1 Barrel in VG+ condition not sure if the Flash hider or Delta ring are original to it and at some point, the FSB was removed and put back on. CLICK TO SEE =1&c[content]=thread&c[nodes][0]=4&c[users]=eldbillbo&o=date']all my classifieds CLINK TO SEE Trades Wanted
  9. 22hopper

    Complete Bolt Carrier Groups (BCGs) - $85 each!

      1. For Sale
      2. For Trade
    • $85
    • Lake Oswego
    • Oregon
    For sale are four complete bolt carrier groups. I received these as part of a trade and this is way more bolts than I need so hoping to pass along to someone that can use them. These are basic 5.56 BCGs. All seem well staked. All are full auto cut. 2 are lightly used (less than 100 rounds)...
  10. RobMa

    New Daniel Defense barrel 10.3 CHF (Brand new, never fired) -- big price drop --

      1. For Sale
    • $299
    • Seattle
    • Washington
    NEW Daniel Defense Barrel AR-15 Pistol 5.56x45mm 1 in 7" Twist 10.3" Government Contour Carbine Gas Port with Low Profile Gas Block Hammer Forged Chrome Lined Chrome Moly Matte. This is a new barrel and never had rounds put through it, I bought it new. There is oil on it thus there is dust on...
  11. RobMa

    Daniel Defense 5.56 NATO / 300 Blackout (7.6x35mm) full-auto compatible, M16 Profile, complete BCG assembly **price drop**

      1. For Sale
    • $175
    • Seattle
    • Washington
    Daniel Defense 5.56 NATO (5.56x45mm & .223 Remington) / 300 Blackout (7.6x35mm) full-auto compatible, M16 Profile, complete bolt carrier group assembly. In new condition, never used (fired). It is slathered in oil to keep it protected while in storage, as a result there is dust on it... I take...
  12. E

    BCM® Bolt Carrier Group (MPI) - Auto

      1. For Sale
    • $189
    • The Dalles
    • Oregon
    Selling a brand new AR15 bcm carrier for 189 pick up or 189 PayPal shipped.
  13. eldbillbo

    Left handed Bolt Carrier Group. 5.56, Nitride, Stag Compatible, Unfired. $185

      1. For Sale
    • $185
    • Oregon City
    • Oregon
    It's an unfired complete left-handed bolt carrier group. TRADES WANTED. Please note when offering trades please note the trade value of your items or at least say I will trade this for that. Some of the specific parts I am looking for are Warne 1 pc Scope mount for 1" tube. Warne Scope...
  14. 22hopper

    AR-15 Bolt Carrier Group (BCG) - Nitride - $100

      1. For Sale
    • $100
    • Lake Oswego
    • Oregon
    Brand new never used BCG for AR-15/M16 for sale. Nitride finish. Bolt material is 9310 alloy. Bolt is marked MPI as shown. Not sure on brand, but thinking it might be AO Precision. Cash only. No trades. Face to face in Lake Oswego. Will ship for extra.
  15. JohnnyHammersticks

    Brownells Nickel Boron AR-15 Bolt Carrier

      1. For Sale
      2. For Trade
    • $150
    • Albany
    • Oregon
    Brand new, never used. Came from a canceled build. Trade for factory new brass case .45 ACP $150
  16. N

    Aero Precision - 5.56 Bolt Carrier Group, No Logo - Black Nitride

      1. For Sale
    • $125
    • Seattle
    • Washington
    Almost new BCG from Aero Precision. Was put in a rifle and used with a few snap caps. I don't have the original box but I do have one from a different BCG that you can have. $125 cash if you can meet in the Seattle area and save me the hassle of electronic payments and shipping.
  17. eldbillbo

    Left handed Ar15 Bolt Carrier Group Nitride works with Stag compatible uppers

      1. For Sale
    • $185
    • Oregon City
    • Oregon
    New unfired Trades considered please note when offering trades please note trade value of your items or at least say I will trade this for that. Some of the specific parts I am looking for are 450 Bushmaster upper or parts, 20" 5.56 barrels, A1 and A2 upper receivers A2 rear sight...
  18. bobcat7677

    BCG - Nitride Full Auto Type Bolt Carrier Group 5.56

      1. For Sale
      2. For Trade
    • $140
    • Oregon City
    • Oregon
    Nitride treated full auto type BCG. New in the box. I ordered it for a build and then decided to do something different. Asking $140.
  19. R

    Bolt carrier group

      1. Want to Buy
    • Milwaukie
    • Oregon
    Looking for a bcg to complete my ar build. Nothing high end. Used ok.
  20. glockguy

    White label armory 223/556 BCG

      1. For Sale
    • $120
    • Lebanon
    • Oregon
    I have a few new nitride white label armory BCGs. 120$ each
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