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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.
Selling my 16" aero 556 upper. I have had maybe 200 rounds through it and it's always run flawlessly. I'm moving to a piston upper though.
Includes aero nitride BCG and Warhammer charging handle.
AR15 complete upper from Larsen Outfitters. Barrel is a 7.5" SS Ultramatch 556 NATO from Rainier Arms. Mil-spec M4 upper receiver, 7" MLOK free float handguard with comp cut. Nickel Boron BCG, A2 flash hider, standard charging handle. All brand new!
Not interested in any trades. I do accept...
New in wrapping sealed from factory comes with geissele bcg and ch non blem purchased a few months ago for 1300. They are 1410 when in stock and are oos at most places. Just looking to get money back. Prices went up the month after I bought. Save $150ish buy mine and no wait. Meet in Salem and...
Selling a 12” free float hand guard from Stubborn Mule Outdoor Supply. Includes barrel nut and screws. Would go great on an M-16 upper or any midlength upper. Free float hand guards that are of good quality are hard to find. Asking for $60 cash no trades. Local sales preferred. Everything else...
New in sealed box. If you want a picture of the brown cardboard box I’ll send one.
https://www.del-ton.com/Custom-Upper-p/cu112.htm
Includes BCG and charging handle.
$275 shipped to PNW.
Decided to go another way. Factory built Triarc 10.5” 5.56 upper w/ factory BCG. AAC 51T brake. I ran 3 mags through this to confirm function and zero. Amazing little upper. This model will currently set you back roughly $1100 and has a 10 month minimum lead time.
Installed in a build but never fired, no box. Paid 135 looking to get 120$. Must pick up in west salem preferably. Will not ship. We all know what a new aero logo bcg nitrided looks like so i wont worry about a pic till i get home.
Brand new Aero Precision BCG in 5.56
This is the black Nitride finish model
From the website:
Features:
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 that minimizes the...
BCM upper and BCG had 50rds on them before disassembly, charging handle is new (have the package if you want it)
Asking $300 willing to ship USPS Priority Mail for $10.
I accept cash, Venmo or PayPal friends and family with no comments.
Trades:
Aero M5 enhanced upper receiver in FDE
20”...
Selling the BCG from my M&P15 I bought back in 2011. Less than 2k rounds on it.
Needs a new cam pin; and the gas rings have some life left in them but could be replaced also.
Just cleaned it a few days ago.
$65 firm shipped.
Paypal or Zelle accepted. Shipped continental US only
Due to the upcoming ban in WA I am moving to another state so some projects must go to fund the move. I am fairly new to this forum but I've sold on 1911addicts and gunbroker with good reviews (Oldmasterzhu) so buy with confidence.
All parts taken off of an M4 marked 6920. Afaik that was during...
Hi all,
I have a FailZero BCG for sale, unused. I racked it once or twice when I mocked it up in an upper, and never shot it. Looks new, cause it basically is. I ended up not liking how my ARs looked with silver BCGs or barrels 🤷♂️.
$100, local (pdx area) meetup preferred.
Thanks,
Sean
SPF C.I. Glock
I got a 16” DD to DMR instead.
Brand new upper, never fired by anyone but DD factory. Comes in the original box with all accoutrements.
Some basics:
3.5lb
7075 Upper
5.56 NATO CHF Chrome Lined Barrel 1:7 Twist
10” Ultralight MFR MLOK Rail
M4 Ramps
M16 BCG
Ambi charging handle...