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bolt carrier group

A bolt is the part of a repeating, breechloading 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 firing pin and extractor are often integral parts of the bolt. The terms "breechblock" and "bolt" are often used interchangeably or without a clear distinction, though usually, a bolt is a type of breechblock that has a nominally circular cross-section.
In most automatic firearms that use delayed blowback, recoil or gas operation, the bolt itself is housed within the larger bolt carrier group (BCG), which contains additional parts that receives rearward push from a gas tube (direct impingement) or a piston system.
The slide of a self-loading pistol can be considered a bolt carrier, as it contains the same components and serves the same functions.

View More On Wikipedia.org
Recent contents
  1. arjunki

    New Macon Armory AR15/9mm PCC BCG

      1. For Sale
    • $160
    • Beaverton
    • Oregon
    These are very popular with the PCC competition shooters as well as the full auto guys. They rarely stay up on his website more than a day before they sell out again. They are currently showing out of stock at the time of this posting and have been out for some time. I am listing this one here...
  2. arjunki

    Complete AR9 7.5" Ballistic Advantage AR Pistol Upper with BCG & CH Plus extras

      1. For Sale
    • $500
    • Aloha
    • Oregon
    I got this in a trade a while back. It came to me with the "new but test fired" narrative. And it appears to be the case. I planned on going for the tax stamp at the time so I installed an Angstadt Arms 3-Lug 9mm Flash Hider for installing a suppressor or not. I decided not to apply. I also...
  3. TheRealMP

    Aero Precision Nitride BCG

      1. For Sale
      2. For Trade
    • $90
    • Olympia
    • Washington
    I have an Aero BCG. Less than 200 rounds fired. https://www.primaryarms.com/aero-precision-m16-bolt-carrier-group-black-nitride-no-logo
  4. K

    WTS: AR15 BCG New, Mil-Spec

      1. For Sale
    • $110
    • Auburn
    • Washington
    WTS: A new Mil-Spec BCG for AR15, 556/223 from Brownells. $110.00 Shipped, Conus, AK& HI only Message me if interested
  5. UNO

    10 Pmags and a NiB BCG for $156

    Solid deal IMO https://palmettostatearmory.com/psa-premium-5-56-nickel-boron-bcg-10-magpul-pmag-gen-2-moe-5-56x45-30rd-magazines.html?avad=190366_c37879061&utm_source=Avantlink&utm_medium=Referral&utm_campaign=el
  6. PDXElectrician

    PSA PA10 Upper and BCG

      1. For Sale
    • $100
    • Molalla
    • Oregon
    PSA PA10 .308 Nickel Boron BGG. PSA PA10 upper receiver. Asking $100 for the pair. I accept cash and PayPal. I will ship for an extra $10.
  7. PDXElectrician

    Solgw BCG New in box

      1. For Sale
    • $125
    • Molalla
    • Oregon
    Never fired SOLGW BCG.
  8. W

    Carry handle upper with bcg AND OPTIC

      1. For Sale
    • $840
    • portland
    • Oregon
    Harrington and Richardson upper with standard bcg and charging handle about 80 rounds through it but Carry handles just ain't for me. 14.7 INCH BARREL WITH A PIN AND WELD A2 FLASH HIDER asking 600 cash without optic no trades please 840 cash with optic optic is a 3X primary arms microprism...
  9. s75n

    E2 Armory (AO Precision) AR/M16 BCG Phosphate/Chrome

      1. For Sale
    • $70
    • Portland
    • Oregon
    New never installed $70 Meet near SE 33rd Powell Blvd https://e2armory.com/product/bolt-carrier-assembly-group-ar-m16-chrome-phosphate-test-fire/
  10. cityrice

    AR-15 6.5 Grendel BCG Type 2

      1. For Sale
    • $60
    • Saint Helens
    • Oregon
    I have a new Bear Creek Arsenal AR-15 6.5 Grendel BCG Type 2 for sale
  11. J

    SPF 6.5 Grendel Upper Complete with BCG -- $240

      1. For Sale
      2. For Trade
    • $240
    • Portland
    • Oregon
    I bought this 6.5 Grendel II upper from Combat Armory and never used it. It has the BCG and CH, ready to be added to a pistol or SBR lower. 13" Stainless barrel, 1/8 twist MPI tested bolt 12" MLOK rail M4 feed ramps $235 FTF in the Portland or Vancouver area. Cross posted.
  12. Illuminaughty

    Want to trade for new BCG.

      1. Want to Trade For
    • Veneta
    • Oregon
    Have 223/556, 9mm, 762x39 or 12g ammo, black SBA3 brace or a few other AR parts to trade, could also do a little cash. Not picky on brand, provided it’s at least PSA/toolcraft quality or better. FTF in Veneta/Eugene area is ideal, but not opposed to shipping.
  13. huntpotter

    AR Parts, Aero Upper, FDE Forearm, Nitride BCG ** Discount Deal **

      1. For Sale
    • $50
    • Vancouver Ridgefield
    • Washington
    Up for sale. SW Washington, Vancouver area, Clark County area. Leftover AR parts. Mocked up an upper, and didn't end up using. Aero M4-E1 upper. Burnt Bronze anodized. Used, with a couple wear spots. ($50 cash) Expo (Primary Arms), 15" Mlok handguard, with barrel nut. FDE. As new. ($50 cash)...
  14. dbg19

    Bolt Carrier Group from Palmetto State Armory

      1. For Sale
    • $60
    • GRESHAM
    • Oregon
    5.56 BCG from Palmetto State Armory Nitride. No logo. Brand new in box. $60 No Trades. Pick up in Gresham/ Outer SE PDX. +$9 shipped usps w/ tracking. Venmo/Zelle/Cash App
  15. GI JEW 555

    LMT Monolithic Upper with BCG

      1. For Sale
      2. For Trade
    • $1400
    • Tacoma
    • Washington
    LMT Monolithic piston 14.5 pinned and welded upper with LMT BCG / Charging handle / CQB rail. This upper is pretty cool , it has the ability to swap barrels out in seconds with just pulling the two pins. It’s in really good condition and very little use. Only trade at this time would be...
  16. GCC_GOAT

    9mm Bcg

      1. Want to Buy
    • Winlock
    • Washington
    As the title says, pretty self explanatory. Trying to finish a new battle beater and in need of a 9mm Bcg. Thanks!
  17. Roadpirate2322

    Sharps rifle company bcg

      1. For Sale
    • $140
    • Albany
    • Oregon
    Sharps rifle company BCG Less than 500 rounds fired. $140 ftf in Albany $150 shipped
  18. T

    *SOLD* Ballistic Advantage AR10 BCG black nitride NEW

      1. For Sale
      2. For Trade
    • $160
    • Cedar Hills
    • Oregon
    Brand new and still in the wrapping. Purchased with intent of building an AR10 but switching directions. Asking $160 Pictures from the website with info. Trades: 300BLK Lancer mags
  19. R

    5.56 Upper, No BCG or Charging handle $100

      1. For Sale
    • $100
    • Beaverton
    • Oregon
    DPMS Upper with 5.56, 1/9 twist HBAR barrel, 500ish rounds No charging handle or BCG I remove the A2 site and installed a low profile, stainless gas block. Black Magpul furniture
  20. Khalsa

    BCM Upper with BAbarrel/ Surefire mount FH, Microbest BCG, BCM CH, BFG sling adapter

      1. For Sale
    • $750
    • Eugene
    • Oregon
    Beautiful new build. Gauged the headspace, pieced this beautiful upper together using a stripped forged Milspec 7076T6 aluminum upper and a 12 inch BCM QRF(Quad rail free floated), it has a Surefire closed tined flash hider suppressor mount muzzle device, a Microbest Phosphate bolt and carrier...
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