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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. officially5150

    Looking for a bolt carrier group and mil spec buffer tube

      1. Want to Buy
    • SALEM
    • Oregon
    Trying to find a 556 bolt carrier group and mil spec buffer tube for a budget build im working on. Thanks
  2. M

    Bolt carrier group

      1. For Sale
    • $80
    • Oregon City
    • Oregon
    Like new bcg that was in the wife’s rifle. Purchased for $140. I can’t remember what brand. Runs flawless. Hpt/mpi. Good to go. $80
  3. FA9

    Geissele Nano Bolt Carrier Group Silver or Lantac bcg

    Both on sale/instock as of 6/6/2022 https://tombstonetactical.com/product/geissele-ar15-parts-nano-bolt-carrier-group-silver-05490-model-05-490.-geissele-nano-bolt-carrier-group-silver-05-490.#product_detail $249 https://www.aimsurplus.com/products/lantac-enhanced-223556-nib-bcg $261
  4. OrygunARMS

    AR10 / .308 - NATO 7.62 BOLT CARRIER GROUP

      1. For Sale
    • $99
    • Beaverton
    • Oregon
    Bought as a spare during a sale. I’ve finally upgraded my main two, and this one’s just going to sit. Priced to sell, non stamped Toolcraft mil-spec grade. Will ship in the states. I have a basic charging handle, and short 308 buffer as well; if interested. The enhanced bolt carrier is...
  5. RobMa

    Colt 1990's complete bolt carrier group (New old stock, pulled from a new LE/Mil 6920) - price drop-

      1. For Sale
    • $199
    • Seattle
    • Washington
    Colt 1990's complete bolt carrier group (New old stock, pulled from a new LE/Mil 6920) The rifle it was pulled from was never fired and this BCG is in pristine condition with great staking and old school Colt quality. Please PM me for any questions I take PayPal friends and family Shipping...
  6. T

    14.5” BCM upper and bolt carrier group (NEW)

      1. For Sale
    • $700
    • The dalles
    • Oregon
    BCM Standard 14.5" Mid Length Upper Receiver Group w/ MCMR-13 Handguard, BCM® Bolt Carrier Group: BCM® Bolt Carrier Group (MPI) (Auto) Muzzle Device: Flash Hider A2
  7. S

    M16 Bolt Carrier Group Milspec-Emtan

      1. For Sale
    • $75
    • Lake Oswego
    • Oregon
    SPF Brand new M16 Bolt Carrier Group complete Made by Emtan, these are contract overruns from a mil. contract. Milspec Carpenter 158 bolt HPT/MPI 8620 Steel Carrier Chrome Lined Carrier Upgraded extractor w/O-ring insert Grade 8 staked fasteners Manganese phosphate Emtan is approved for use by...
  8. Espire

    AR15 - POF drop in triggers

      1. For Sale
    • $110
    • Ridgefield
    • Washington
    All items are new in packaging. 3 - POF trigger - $110 per trigger (2 will run you 105 each, 3 will run you 100 each) Will ship on your dime
  9. B

    2x AR15 Bolt Carrier Groups 5.56

      1. For Sale
      2. For Trade
    • $75
    • Corvallis
    • Oregon
    I've got 1 brand new BCG for 5.56 or 300BO AR15's. One is Phosphated (HPT/MPI marked bolt) with absolutely no wear, factory fresh parts. Asking $75, I can ship one on the buyers dime. Only trades I'm interested in would be CCI #200, CCI #400 or IMR 4166. Meet in Corvallis or Albany. The...
  10. papersoldier

    Brownells 308AR (AR-10) Bolt Carrier Group - New

      1. For Sale
    • $100
    • Rainier
    • Oregon
    Selling a brand new, never installed black nitride Brownells 308AR Bolt Carrier Group. Got it a while back for a project that I never got around to and totally I forgot I had it until today. Asking $100. Can meet up in Clatskanie or Rainier. Not looking for any trades currently.
  11. T

    14.5” BCM upper with bolt carrier group

      1. For Sale
    • $775
    • The Dalles
    • Oregon
    Brand new BCM® Standard 14.5" Mid Length Upper Receiver Group w/ MCMR-13 Handguard, BCM® Bolt Carrier Group: BCM® Bolt Carrier Group (MPI) (Auto) + $189.00, Muzzle Device: Flash Hider A2 2
  12. V4Cascade

    Bolt Carrier Group (BCG)

      1. For Sale
    • $65
    • Gresham
    • Oregon
    Selling off a spare to fund more spare parts.......the irony....... Unmarked FA BCG, got this some time ago so not sure who the mfg is anymore? Bolt is mark MPI. I will also include (10) Extractor donuts. Unfired but has been racked a few times. $65 ftf in Gresham.
  13. Reaper79

    Cmmg 9mm barrel bolt carrier and mags

      1. For Sale
    • $600
    • Gresham
    • Oregon
    Selling just the barrel, bolt carrier and 6 30 rounds mags. $600. If you want the 7 inch yankee hill hand guard with billet upper reviever, strike industries charging handle, muzzle brake and flip ups sights, add $200. Note: this is the radial delayed blowback setup. So it won't run on the...
  14. doomsday

    Anderson 300 Black Out 7" barrel with charging handle and bolt carrier group

      1. For Sale
      2. For Trade
    • $225
    • COLTON
    • Oregon
    For sale or trade. Anderson 300 Black Out 7" barrel charging handle and bolt carrier group. Trade for a 556 pistol upper. Or 225.00 cash
  15. DonkHumpington

    PSA Nitride MPI Full-AUTO 5.56 Bolt Carrier Group

      1. For Sale
    • $60
    • Silverlake
    • Washington
    Brand new/never used. $60 f2f, $68 shipped. PSA Nitride MPI Full-AUTO 5.56 Bolt Carrier Group PSA 5.56 nitride MPI full-auto bolt carrier group. Bolt is Magnetic Particle Inspected (MPI). 8620 Full-auto profile bolt carrier group with 9310 steel bolt. Gas Key Hardened to USGI...
  16. .45's and .38's

    New bolt carrier group

      1. For Sale
    • $75
    • Portland
    • Oregon
    Unused No logo 9310 bolt carrier MPI Black nitride finish Purchased from palmetto last December been sitting for a build that never got done $75 $70 pickup 181st Ave
  17. DonkHumpington

    New> PSA 5.56 NITRIDE MPI FULL-AUTO BOLT CARRIER GROUP

      1. For Sale
    • $60
    • Silverlake
    • Washington
    Have a new one of these. $60 + $5 shipped to your door. https://palmettostatearmory.com/psa-5-56-nitride-mpi-full-auto-bolt-carrier-group-516446953.html
  18. RobMa

    Colt 1990's complete bolt carrier group (New old stock, pulled from a new LE/Mil 6920)

      1. For Sale
    • $295
    • Seattle
    • Washington
    Colt 1990's complete bolt carrier group (New old stock, pulled from a new LE/Mil 6920) The rifle it was pulled from was never fired and this BCG is in pristine condition with great staking and old school Colt quality. Please PM me for any questions I take PayPal friends and family and Venmo...
  19. .45's and .38's

    Bolt carrier and charging handle combo

      1. For Sale
    • $90
    • Portland
    • Oregon
    Brand new nitride carrier from palmetto and charger unused Bolt is 9310 MPI $90 or trade for tall MRO mount
  20. AlaskinAssasin

    Aero precision bolt carrier group I have 5 of them nib

      1. For Sale
      2. For Trade
    • $130
    • Sisters
    • Oregon
    These are new in the box Aero precision bolt carrier groups. Willing to meet in the middle on a drive or ship for 10 bucks.
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