DESCRIPTION – ABABCGNiB (A*B Pro 5.56 Bolt Carrier Group)
A*B Arms A*B Pro 5.56 Bolt Carrier Group is built to Mil-Spec dimensions. The Nickel Boron coated Bolt and Cam Pin need virtually no lube during use. The Nickel Boron coated Carrier is coated for extra lubricity and the extractor has a surface finish that provides superior extraction during firing.
These Bolt Carrier Groups are ready to drop into your rifle. Our Bolt Carrier Groups are specially made on high-end, Swiss machinery to have exacting tolerances and surface finish. A*B Arms is known by rifle manufacturers for manufacturing one of the finest quality bolts and extractors available. This has won us contracts with some of the highest quality AR manufacturers in the business. If you want to buy super high-quality parts offered by the company that actually manufactures them, then you’ve come to the right place.
Bolt
- 9310 Steel
- Heat treated per Mil-Spec Requirements
- Shot Peened per Mil-Spec Requirements
- MPI Tested Material
- Nickel Boron Coated
Bolt Carrier
- 8620 Steel
- Nickel Boron Coated
- Nickel Boron Coated Bore
- M-16 Style with more mass for better functioning in semi or full auto rifles
Gas Key
- 4130 Steel
- Nickel Boron Coated per Mil-Spec Requirements
- Gas Key Screws – 4140 Steel Properly Staked per Mil-Spec Requirements
Cam Pin
- 4340 Steel
- Heat Treated per Mil-Spec Requirements
- Nickel Boron Coated per Mil-Spec Requirements
Extractor
- Aircraft Quality E4140 Steel
- Heat Treated per Mil-Spec Requirements
- Shot Peened per Mil-Spec Requirements
- Nickel Boron Coated per Mil-Spec Requirements
Firing Pin
- 420 Steel
- Passivated
Bill Ward –
Great BCG I have 2 worth every penny lots of rounds syill tight and smooth.
Jim –
Waited to review as I needed to put some rounds thru my Springfield saint. I’ve put around 300 rounds thru this BCG and it is just fantastic. I was surprised that there is no markings on it but talked to customer service and they don’t mark it. I can only say this BCG Is extremely well built and it was flawless using steel and brass ammo. Not one issue. Was simple to clean ended up buying another one for my son. They are absolutely a superior product.
Ronnie –
Got this BCG from optics planet a couple years ago to run in my (mostly) suppressed 11.5 carbine. Along with a vltor a5h3 buffer, sprinco green spring, riflespeed adjustable gas system (for quick unsuppressed/suppressed shooting), and lubed up and down with gun butter, this whole system is near perfect. It’ll be perfect when I get a Noveske 11.5 mid length barrel lol.
It’s been through many range days and comps at a high rate of fire with no hiccups. Great quality and durability even all gunked up with mud and it still locks on the last round. I’ll keep this thing running until it snaps in half, then I’ll buy it again!