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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.
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.
- Criterion Core 14.5" Barrel
- BCM Blem thermal fit Upper receiver
- BCM gas...
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
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.
2 x Phosphate w/ C158 Bolt, No logo - $120 each
5 x AR15 Assembled Upper Receiver - $110 each
Cash, Electronic payment, or USPS Money Order
Let me know if you have any questions!
This was on a build i swapped for a traditional rear charge upper.
its super beefy looking
I bet it can take a lot of abuse.
Its looks would go really well on a billet lower
Very low round count, maybe 200.
Nevermind the pics of it all taken apart its back together
I bought this new. I had it on my wish list but kept missing it whenever it came into stock. After about 1 year I snagged this one for $629 direct from PSA. I briefly installed a BCG [not included]and put it on a braced lower. I never even had time to buy an optic and FJB/AFT came along with...
This is a complete setup, ready to drop on a pistol or SBR lower and shoot. I know the market on these is out of whack thanks to FJB and the AFT brace fiasco. However, I tried to price it fairly considering what's included. Here's what you will get:
PSA 10.5 barreled upper chambered in 300...
Both new and never been out of original packaging. Bought these for a build that never happened.
Ballistic Adv BABL224V04PL AR Barrel Premium 224 Valkyrie 18" AR-15 416R Stainless Steel Bead Blasted DMR Rifle Length Fluted
Aero Precision AR15 .224 Valkyrie/6.8 SPC Bolt Carrier Group (BCG)...