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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.
BCM square/star forge mark upper receiver, BCM .625 gas block and CMT DRT 10.5 handguard. Selling these together for $220.00
Upper and gas block have no rounds on them, upper was fit to a couple lowers and gas block was test fit to barrel. Second owner of the handguard. Great condition, has a...
UPDATE: 1x upper for sale as one has been sold.
Up for sale is an unfired and new upper from PSA. I bought them as a kit a year ago for some projects, which I abandoned and decided to go in another direction. Have been inside my safe and never fired. Clean and new (I can take more photos if you...
Microbest 5.56 BCG C158 MPI Chrome w/ Phosphate Extractor
This would make a fantastic spare or replacement BCG for your favorite rifle. Great price on these.
Chrome finish is great for running a dirty gun (suppressed or otherwise) as it's a much easier surface to clean, and Microbest is one of...
Letting go of a build I never got around to finishing. Moving to Vietnam for work for a couple years and won't finish it before I leave.
Everything but the BCG has 20 rounds on it to test function. BCM BCG is new. The rail that was on it is sold and the I’m keeping the muzzle device for my...
In very good condition. Daughter used it 2 years ago hunting and has not been shot since. Less than 200 rds through it $400
Trades Wanted
AR15Carbine Rifle Case
5.56/.223 ammo
9mm ammo
Remington thunderbolt
Weibad Rear bag.
XD9 optics ready slide. I have an ordinary XD9 slide to trade as...
BCM Blem Uppers
These uppers are still apart of the free BCG promotion ($200 savings), and from the description only have a cosmetic blem on them so it would be a fantastic way to get into a BCM upper.
Just missing the charging handle from what I can tell.
Looking to buy, or trade for, a 5.56 BCG for a workhorse/duty rifle. Something slick, and a step above milspec, but not flashy. Black or grey only. No chrome, gold, etc. Aero, CMC, SD, BCM, Lantac, etc. Please reach out by PM with what you have, and what you’re looking for. Up front cash price...
Knights Armament URX 4 10.75 Rail Mlok
Disclaimer
Buyer pays transfer fee's unless otherwise negotiated.
Seller reserves right to back out of all deals anytime prior to goods exchange for any reason.
FSOT Silver/CASH/VENMO/PP willing to ship. Looking for but not limited to. EOTECH EXPSxx...
Have a few extras I don't need so figured I'd toss them up for sale.
Aero BCGs:
2 x Phosphate w/ C158 Bolt, No logo - $115 each
Aero Uppers:
5 x AR15 Assembled Upper Receiver - $105 each
Cash, Electronic payment, or USPS Money Order
Let me know if you have any questions!