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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.
So I just built a lower and when going to cycle and make sure everything works, it cycles fine, I can dry fire but then when I charge the bolt again with trigger pressed, when I release for bolt to go into battery and trigger reset, it returns “slowly” as it’s getting stuck somewhere and...
Selling to fund a different build. It’s a 14.5 BFH govt profile pinned and welded to 16”, still in its original box in the oil. I paid $1005 plus tax and shipping so I think $975 is pretty fair. Only partial trade I would consider is cash + a red dot in good condition.
I'm gonna regret posting this, but I want a new BCG for my M&P15.
I don't care about other BCG options that are out there or opinions. I'm down to the four choices that are in the poll.
Poll ends in 7 days, so please help me out in choosing.
Thanks A LOT.
I bought this last year and put some rounds through it, but realized it wouldn't fit a suppressor and I ended up buying another complete upper on one of Primary Arms sales (stupid email deals that get me to click).
Anyway I don't need this one, it is a Palmetto State Armory 4" Barrel with 6"...
Item:
BCM® Standard 11.5" (Enhanced Lightweight) Carbine Upper Receiver Group w/ MCMR-10 Handguard w/ BCG
Price:
$600
Location:
Portland. Will ship if you pay
This is brand new, never even mounted to a lower. Comes with the hardware shown, decals and the BCM BCG. I changed my mind on my...
Aero Precision Black Nitride bolt. Bolt was used for less than 100 rounds before it was swapped out with a nickel boron bolt. This is for the bolt (with gas rings) only. No carrier, cam pin, cotter pin, or firing pin.
$75. Pickup in Sumner, Puyallup.
Selling my recently built Aero Precision FDE M4E1 complete upper receiver - taken out for function test (~30 rounds) & cleaned after. Worked perfect w/o any issues.
Parts list:
- Aero Precision M4E1 Upper Receiver - FDE
- Aero Precision Atlas S-ONE 9" FDE Handguard
- 12.3" Ballistic Advantage...
I have a PSA 6.5" upper receiver with the following info:
The Upper is used in good condition with about 500 rounds through it
Barrel: 6.5" 4150V Chrome Moly vanadium steel, nitride treated for durability, and chambered in 5.56 with a 1 in 7" twist. Finished off with a PSA 9" M-lok Rail, a low...
I have a new/unfired PSA 7 inch upper receiver with the following features:
Barrel: 7" 4150V Chrome Moly Vanadium steel, nitride coated and chambered in 5.56 NATO with a 1 in 7" twist. The pistol-length gas barrel is finished off with a PSA 6.5" Lightweight M-Lok Rail, a low-profile gas block...
I have a new/unfired PSA 7 inch upper receiver with the following features:
Barrel: 7" 4150V Chrome Moly Vanadium steel, nitride coated and chambered in 5.56 NATO with a 1 in 7" twist. Pistol-length gas barrel is finished off with a PSA 6.5" Lightweight M-Lok Rail, a low profile gas block, and...
Want to have the loudest gun on your block?
For Sale 5.56 complete upper receiver including bolt carrier group, Aero Precision barrel, charging handle and angled foregrip . Comes with a YHM QD muzzle brake that works with their Turbo cans.
$500 $475 $400 NOW $350!! Cash only FTF in...
Good day wonderful Northwest firearms group, I'm looking for a couple BCG's and parts, FYI - looking for parts to finish my builds before Inslee drops his personal agenda on washatonians with his dreams of a California state............ Payment for sale will be with Zelle
CMMG 22LR BCG...