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bolt carrier
A bolt is the part of a repeating, breech-loading 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 extractor and firing pin are often integral parts of the bolt.
In gas-operated firearms, the bolt itself is housed within the larger bolt carrier group (BCG), which contains additional parts that receives rearward push from the gas piston.
The slide of a semi-automatic pistol is a form of bolt, as it contains the same parts and serves the same functions.
Not sure what shipping is but at time of this thread creation they had both of these in stock:
$130: https://aimsurplus.com/aim-ar-m16-223-5-56-nib-9310-mpi-bolt-carrier-group-x2/
$140: https://aimsurplus.com/aimsurplus-ar-m16-223-5-56-tin3-bolt-carrier-group/
Please PM with any questions or to set up a time to meet.
For sale is a new in package Aero 5.56 bolt carrier group. This is a quality unit that is difficult to find in stock right now. Along with the BCG (package deal), I am selling 200rnds of 223, 50rnds of 9mm and 275rnds of 22LR ammo...
If anyone wants a custom upper build let me know. I can do it for free I do have more build parts not listed.
These go great with extra power buffer springs or adjustable gas blocks or even better if you just are not getting enough gas because it solves a problem without drilling and you are...