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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. localbrew

    BCM Bolt Carrier Group - BCG

      1. Want to Buy
    • West Linn
    • Oregon
    Looking for a new BCM BCG .223/5.56; hopefully someone knows where I can find one or has a new one laying around :)
  2. pnwhunter69

    Geissele REBCG (reliability enhanced bolt carrier group) brand new!

      1. For Sale
    • $295
    • Molalla/Oregon city
    • Oregon
    Geissele REBCG (reliability enhanced bolt carrier group) nano-weapon coated bolt carrier group Brand new and unfired $295 cash, no trades
  3. s75n

    AO Precision Premium Phosphate Bolt Carrier Group - 158 HPT/MPI $60

    https://www.righttobear.com/ao-precision-phosphate-bolt-carrier-group-158-hp-aom16-hpt-mpi/
  4. C

    GEISSELE "Super Duty" REBCG ~ "reliability enhanced bolt carrier group" > SALE PENDING < NOW $265 DOLLARS

      1. For Sale
    • $299
    • Hillsboro
    • Oregon
    ><><>>>>>> REDUCED PRICE <<<<<<><>< Selling my "spare" REBCG as I need to recover some funds from purchases and since all of my "gas guns" have these in them I'm confident I'll never need it. NANOWEAPON GEISSELE "REBCG" ~ RELIABILITY ENHANCED BOLT CARRIER GROUP 100% as pictured mint ~...
  5. matts

    PSA full auto Bolt Carrier Group, lightly used

      1. For Sale
    • $80
    • Vancouver
    • Washington
    $80 ~50 rounds through it These are fully tested, also they come with the extractor spring upgrades
  6. T

    Brand New Microbest Bolt Carrier Group - Phosphate / Chrome Key & Bore

      1. For Sale
    • $149
    • Beaverton
    • Oregon
    I have two brand new 556 bolt carrier groups for sale. They are manufactured by Microbest and were both purchased from PK Firearms about 6 months apart. Both are brand new, never fired, comes with packaging. PK says they will not have any more of these in stock for the foreseeable future...
  7. O

    JP Enterprises LMOS Polished Bolt Carrier

      1. For Sale
    • $185
    • Bend
    • Oregon
    A gently used, very low round count JP Enterprises small frame LMOS Polished Bolt Carrier. Makes for a softer and faster shooting rifle. In excellent condition. $185 shipped **This bolt carrier works very well paired with the SLR Sentry 7 Titanium Adjustable Gas Block I have listed on here in...
  8. B

    Nickel boron bolt carrier group.

      1. For Trade
    • Portland
    • Oregon
    It's nice. 30 rounds through it. Clean mostly. Looking to trade for maybe a pair of black phosphate BCG. Or a BCG and AR parts.
  9. .45's and .38's

    Bolt carrier group

      1. Want to Buy
    • Portland
    • Oregon
    I’ll trade 40 bucks and the rest in brass 9mm Thanks ☺️
  10. B

    Pistol uppers. 300 blackout and 556. Plus bolt carrier group!

      1. For Trade
    • Portland
    • Oregon
    Top one has a Troy rail 1/8 556. 10.5 I believe. Previous owner used it for shooting 22lr. Round count is around $100 I believe. Bottom is 8.5 300 blackout PSA. Previous owner shot 30 rounds so extremely lightly used. Also have a bolt carrier group for the both of them. Brand new PSA I...
  11. Espire

    Rock River Arms Semi Bolt Carrier Group

      1. For Sale
    • $75
    • RIDGEFIELD
    • Washington
    Bought new originally as a backup, then was used for a bit until my Noveske BCG came it. Been collecting dust ever since. Been used for about 500 rounds. $75 takes it. Will ship on your dime. Any question, feel free to message or text/call: 503-319-3842
  12. WOT Triggers

    Black friday deal: Bolt Carrier Groups

    Hey I thought the prices were pretty good here https://www.surplusammo.com/categories/deals/cyber-monday-black-friday-deals.html
  13. barrigadaharley

    308 Bolt Carrier Group

      1. Want to Buy
    • Hillsboro
    • Oregon
    Looking for a basic 308 BCG such as Aero. Or ToolCraft. Or even FailZero
  14. T

    LMT FA BCG 223/556 — BRAND NEW

      1. For Sale
    • $160
    • Portland
    • Oregon
    For sale is a LMT bolt carrier group with a 223/556 bolt. Model L7D3. Never been used. MSRP………..$224 Asking………$160
  15. Midasknight

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  16. 22hopper

    Anderson 5.56 bolt carrier group BCG

      1. For Sale
    • $70
    • Lake Oswego
    • Oregon
    For sale is an Anderson 5.56 BCG. Bolt is C158. M16 profile. MPI tested. This BCG is used but in good condition. It has seen approximately a case of brass 5.56/223. Cash only. Face to face in Lake Oswego. Will ship for $10 extra via PayPal FF.
  17. RobMa

    Here we go again (probably) about bolt carrier groups

    BCG's... it is very hard to disseminate all the opinions of all the people all the time so I will ask this question here: What are some of the better BCG's? I always hear about DD, BCM, Toolcraft etc. etc. but is there any definitive data on what is a really high quality BCG that can go...
  18. D

    BCM Uppers Mk2s 12.5 and 16 BFH w/bolt and radian charging handles

      1. For Sale
    • $750
    • Eugene
    • Oregon
    BCM® MK2 BFH 16" Mid Length Upper Receiver Group w/ MCMR-15 Handguard $792 Bcm bolt: 189 Radian charging handle: 70 Asking 850 BCM® Standard 12.5" Carbine Upper Receiver Group w/ MCMR-10 Handguard $675.35 Bcm bolt: 189 Radian charging handle: 70 asking 750 selling uppers only. No fore grip...
  19. C

    ***SPF*** J P ENTERPRISES - AR-15 LOW MASS BOLT CARRIER ASSEMBLY

      1. For Sale
      2. For Trade
    • $180
    • Virginia Beach
    • Other
    ***SPF*** Excellent condition, fired less than 50 rounds with it installed. It does not work the way I want it to for my application. Only trade would include the full mass variant in like condition. Lightweight, stainless steel bolt carrier has significantly lower reciprocating mass than a...
  20. Tgrow503

    Faxon 5.56 .223 BCG Bolt firing pin cam pin NEW

      1. For Sale
    • $75
    • Tualatin
    • Oregon
    Faxon Bolt assembly all brand new .Complete bolt , cam pin , firing pin and cotter pin This came as a head spaced bolt from Faxon with a barrel I purchased. $75 cash FTF I also have a Aero logo carrier for sale that can go with it for $50 .. $125 for the BCG Both are brand new
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