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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. eldbillbo

    LR-308 bolt carrier group Nitride unfired $180

      1. For Sale
    • $180
    • Oregon CIty
    • Oregon
    LR-308 bolt carrier group Nitride unfired $180 Cash or USPS Money Order only. I do not know the brand there are no markings. It is for DPMS style uppers. I also have a couple of compatable barrels listed as well.
  2. farfrompar28

    Aero Precision 5.56 Bolt Carrier Group, Complete - Black Nitride

      1. For Sale
    • $150
    • Shelton
    • Washington
    New never fired, 5.56 Bolt Carrier Group, Complete - Black Nitride. Will ship. Text 3609709514. Jeff $150
  3. N

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

      1. For Sale
    • $150
    • Seattle
    • Washington
    For Sale, Brand new in box Aero Precision - 5.56 Bolt Carrier Group, No Logo - Black Nitride Features: No Aero 'A' Logo M16-cut carrier Machined from 8620 Tool Steel (Carrier) and 9310 Steel (Bolt) Carrier has forward assist serrations Black Nitride Finish - advanced lower friction coating...
  4. pnwhunter69

    full auto bolt carrier group-sold pending funds!

      1. For Sale
    • $140
    • Molalla
    • Oregon
    Toolcraft full auto bolt carrier group. Nitride finish MPI tested 158 carpenter bolt. new unfired bcg in packaging. $140 cash in Molalla, OR
  5. C

    Looking to buy BCM bolt carrier group

      1. Want to Buy
    • Lake Oswego
    • Oregon
    Looking to buy a new BCG for an AR. I've always had good success with my BCMs, so looking to continue with what works. Color doesn't matter, but I'll throw in extra for FDE. Also need a charging handle if you want to do a package deal. Thanks in advance.
  6. parsons_12b

    JD machine Upper with Bolt carrier group

      1. For Sale
      2. For Trade
    • $275
    • La pine
    • Oregon
    Looking to turn this upper into a decent LPVO scope.
  7. T

    SOLD: Fail Zero AR15/M16 Bolt Carrier Group

      1. For Sale
    • $140
    • Portland
    • Oregon
    New "unused" Fail Zero Nickel Boron Coated AR15/M16 Bolt Carrier Group. Purchased two only ended up needing one. $140.00 503-206-9794
  8. A

    LWRC Nickel-Boron Bolt Carrier

      1. For Sale
    • $180
    • Portland
    • Oregon
    https://www.lwrci.com/LWRCI-Direct-Impingement-Bolt-Carrier_p_223.html Brand new, unused, straight from LWRC website. Bolt carrier only. True self-lubricating Nickel-Boron carrier for your mil-spec AR-15. Not that imitation stuff you get from Ares or AimSurplus. Full-Auto rated. One-Piece...
  9. M

    New BCM Bolt carrier.

      1. For Sale
    • $260
    • Lyons
    • Oregon
    Brand New BCM BCG still sealed.face to face NO SHIPPING! You come to my location.
  10. matfish

    NiB AR15 Bolt Carrier Group

      1. For Sale
      2. For Trade
    • $175
    • Salem
    • Oregon
    Pending sale Brand new Aero Precision AR 15 BCG. Was bought as an extra BCG. Was installed into a rifle and taken back out without shooting. Looking to trade for a nice AR trigger local pickup/trade only.
  11. Tht_guy_josh

    WTB 20in ar barrel with a2 fsb or w/o and gold 223 bcg

      1. Want to Buy
      2. Want to Trade For
    • beaverton
    • Oregon
    Looking to buy a 18-20in ar barrel in 556 with a2 fsb or with out one and a gold tin bolt carrier group
  12. eldbillbo

    Ar15 Bolt Carrier Groups 5.56/.223 Mil-spec and Low mass $165-220 Bolts for $35-$40

      1. For Sale
    • $220
    • Oregon City
    • Oregon
    Young's Manufacturing 601/SP-1 style parkerized non-serrated BCG new $165 Spikes Tactical 5.45x39 NiB $220 (NO LONGER AVAILABLE) Reduced Mass Style Lightly Used Spikes Tactical NiB Bolt Carrier Groups 5.56/.223 $210 More info Here...
  13. eldbillbo

    Dedicated .22 Upper with 2A Arms 16" Barrel and bolt carrier assembly Carbon fiber float tube $495

      1. For Sale
    • $495
    • Oregon City
    • Oregon
    16" lightweight, threaded (currently had thread protector on it), dedicated 22lr barrel, titanium bolt barrel, and bolt from 2A Arms. Forged upper receiver. The barrel has a steel liner with aluminum fluted sleave very lightweight yet still ridged there is an issue with the cases being buldged...
  14. dmmv

    Willamette BCGs back in stock for $100

    These are available again. 51 in stock at time of posting. Thanks to @arakboss for original listing. https://willamettemachine.com/product/ar-15-m16-full-auto-bolt-carrier-group-9130-bolt-black-nitride/
  15. arakboss

    For those in need of Bolt Carrier Group. Aim has these units in stock for $130 NiB and $140 TiN

    Not sure what shipping is but at time of this thread creation they had both of these in stock: $130: https://aimsurplus.com/aim-ar-m16-223-5-56-nib-9310-mpi-bolt-carrier-group-x2/ $140: https://aimsurplus.com/aimsurplus-ar-m16-223-5-56-tin3-bolt-carrier-group/
  16. arakboss

    Aero Phosphated 5.56 Bolt Carrier Group (BCG) plus ammo 223, 9mm, 22LR Package Deal For Now

      1. For Sale
    • $290
    • Wilsonville
    • Oregon
    Please PM with any questions or to set up a time to meet. For sale is a new in package Aero 5.56 bolt carrier group. This is a quality unit that is difficult to find in stock right now. Along with the BCG (package deal), I am selling 200rnds of 223, 50rnds of 9mm and 275rnds of 22LR ammo...
  17. eldbillbo

    Ar15 Bolt Carrier groups, Barrels, Upper Receivers and more

      1. For Sale
    • Oregon City
    • Oregon
    If anyone wants a custom upper build let me know. I can do it for free I do have more build parts not listed. These go great with extra power buffer springs or adjustable gas blocks or even better if you just are not getting enough gas because it solves a problem without drilling and you are...
  18. Atmosfear

    JP FMOS AR15 Bolt Carrier

      1. For Sale
    • $160
    • Tacoma
    • Washington
    Brand new, never used. Does NOT include bolt, just the carrier.
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