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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.
I bought this 6.5 Grendel II upper from Combat Armory and never used it. It has the BCG and CH, ready to be added to a pistol or SBR lower.
13" Stainless barrel, 1/8 twist
MPI tested bolt
12" MLOK rail
M4 feed ramps
$235 FTF in the Portland or Vancouver area. Cross posted.
Have 223/556, 9mm, 762x39 or 12g ammo, black SBA3 brace or a few other AR parts to trade, could also do a little cash. Not picky on brand, provided it’s at least PSA/toolcraft quality or better.
FTF in Veneta/Eugene area is ideal, but not opposed to shipping.
Up for sale. SW Washington, Vancouver area, Clark County area. Leftover AR parts. Mocked up an upper, and didn't end up using.
Aero M4-E1 upper. Burnt Bronze anodized.
Used, with a couple wear spots. ($50 cash)
Expo (Primary Arms), 15" Mlok handguard, with barrel nut. FDE. As new. ($50 cash)...
5.56 BCG from Palmetto State Armory
Nitride. No logo.
Brand new in box.
$60
No Trades. Pick up in Gresham/ Outer SE PDX.
+$9 shipped usps w/ tracking.
Venmo/Zelle/Cash App
LMT Monolithic piston 14.5 pinned and welded upper with LMT BCG / Charging handle / CQB rail.
This upper is pretty cool , it has the ability to swap barrels out in seconds with just pulling the two pins.
It’s in really good condition and very little use.
Only trade at this time would be...
Brand new and still in the wrapping.
Purchased with intent of building an AR10 but switching directions. Asking $160
Pictures from the website with info.
Trades:
300BLK Lancer mags
DPMS Upper with 5.56, 1/9 twist HBAR barrel, 500ish rounds
No charging handle or BCG
I remove the A2 site and installed a low profile, stainless gas block.
Black Magpul furniture
Beautiful new build. Gauged the headspace, pieced this beautiful upper together using a stripped forged Milspec 7076T6 aluminum upper and a 12 inch BCM QRF(Quad rail free floated), it has a Surefire closed tined flash hider suppressor mount muzzle device, a Microbest Phosphate bolt and carrier...
Upgraded to a Daniel Defense Mk18 upper, so my old one is now up for sale
- Started as a stripped Ballistic Advantage upper in 10.5". 1/7 twist, 5.56 chambered
- Midwest Industries quad rail handguard in 9.5" length
- Yankee Hill Machine muzzle brake
- BCM angled foregrip
- Primary Arms SLX red...
Brand new in box, unfired, comes with all acessories, sticker sheet, still covered in G96 from the factory. Consistently out of stock, my loss is your gain. Price is shipped from Alabama (I’m away for school at the moment but check out my 100% positive feedback) via PayPal friend and family or...
As new in box, unfired, planned on a pistol build but going a different direction. No charging handle. Comes with BCM BCG as well. Still covered in the G96 BCM puts on their uppers. Asking $775 shipped. Very hard to find in stock and I am just asking what I have into it. Paypal friends...
Practically new Aero m4e1 enhanced upper
20" Faxon Match Series Fluted upper Type II
https://www.primaryarms.com/faxon-firearms-heavy-fluted-20in-6.5-grendel-type-ii-ar-15-barrel-with-np3-finish
VG6 6.5 Muzzle brake
Aero 6.5 BCG Type II
Aero Precision M4E1 upper
Aero Enhanced 15" mlok rail...
Parting out my LMT MWS-H. I've moved mostly to bolt guns in larger calibers and this never gets used. All parts have 18 rounds of IMI 175gr Razorcore on them. I shot 6x 3 round groups at 100 yards off a bipod with no rear bag and the largest group was .8"
Payment: Cash, Zelle or PayPal/FF
-LMT...