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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.
Used for less than 100 rounds. Shoots awesome. I'm selling it because I never shoot it. Barrel is guaranteed sub-MOA by Ballistic Advantage (with match ammo). Includes everything in the photos.
Specs:
Aero Precision M4E1 Upper Receiver, Anodized
Aero Precision 15" ATLAS S-ONE MLOK Handguard...
5.56 barrel which had maybe 300rds through it. I prefer 16in since I am too slow to get a suppressor before they are sold out everywhere :(
11.5 in, 1:7 twist rate
Looking to for 1/2 the cost of a new one, or straight trade for a 300blk upper
Complete 16" 5.56 NATO 1:7 twist upper with upgraded quad picatinny rail. Approximately 200 rounds shot, in great condition. No rear sight.
$210 FIRM
CASH ONLY
FACE TO FACE MEET IN TANASBOURNE (Beaverton) NO SHIPPING
I have only used this on a lower with Colt magazines, I'm not sure if it works with any other type. I bought this a few years back and it's had probably less than a thousand rounds through it. I have recently purchased a buffer less upper, and it only works with Glock magazines. I took off my...
Reduced! $500
Please feel free to ask any questions you may have. I can email more pics too.
Hard to find a rock river arms A2 mid length Hbar. Complete with bcg and ch. This has RRA's 1-9" chrome Moly barrel, code 210 is stamped near the delta ring under the handguards, NOT chrome lined...
My buyer backed out, so I'm putting it back up for sale... Cash only, pickup in Tanasbourne. $220 without the carry handle.
It's a classic AR upper with a 16" barrel 1:7 twist. Maybe 60 rounds through it. It looks as good as new.
No trades or shipping, round count is under 500.
Together with my lower here, you could have almost a whole rifle for $375:
https://www.northwestfirearms.com/threads/aero-m4e1-partial-lower.476724/
All parts are in excellent condition and I have no ise for them so good deals are passed down to whoever want them! Willing to ship anything if buyer pays shipping.
-Zev Tech Muzzle Brakes 5.56 /.223 -$25 each
-Zev Tech glock trigger bar 9mm/.40 gen 3-$25
-Knights Armament authentic USMC flip...
14.5" M4 Barrel, Carbine Gas 5.56 1:7 Twist
Aero Precision 12.75" ATLAS S-One Handguard
JD Machine Upper Receiver with FA and Dust Cover
Aero Precision low-pro gas block
Aero Precision Gas Tube, Stainless
VG6 Delta 556 Muzzle Brake (not pinned and welded)
No BCG or CH.
Upper has roughly 1000...
PSA 7.5" 300AAC Blackout Upper
If anyone has been looking to get into the 300 blackout here's a fantastic chance to do so!
You can also add a complete lower with Magpul SL brace and pistol grip for $130, coming out to right over $400 for a complete 300blk pistol
PSA AR15 COMPLETE MOE BSL EPT...
Complete 18" stag 3g upper with fluted barrel and diamondhead handguard. Bought this new from Stag in 2018 and hardly ever shoot it, maybe 800 rounds down the barrel is all. Includes the following parts.
Sig tango msr 1-6 on sig cantilever mount (have the box for this I'm pretty sure)
BCM...
Selling a low round count in great condition 5.56 upper with a very high quality list of parts:
Centurion Hammer Forged 13.9" Barrel, chrome lined mid-length gas
BCM Mil-spec Bolt Carrier Group
Superlative Arms Adjustable Gas Block
Cross Machine and Tool 13" DRT handguard
Surefire SOCOM...