AR15 5.56 223 Nickel Boron Complete Bolt Carrier Group NIB-X FA
These M16/AR15 FA Cut Bolt Carrier Groups feature NiB-X Nickel Boron Coating, which provides extreme durability, performance, and reliability. The Nickel Boron coating is corrosion resistant and harder than Nickel Teflon, Melonite, or Hard Chrome with a hardness of RC 72. Cycling is smoother and debris and buildup can simply be wiped free. Harris Tactical
Components included in the Assembly are mil-spec and manufactured by US suppliers. The Bolt assembly is case hardened, shot peened, magnetic particle inspected, and constructed of Carpenter 158 steel. The extractor includes a high performance spring and black buffer. The M-16 style Carrier is machined from 8620 steel, heat treated, and case hardened. Attachment of the Gas Key is done with grade 8 hardened fasteners, which are staked per mil-specs. The Gas Key is sealed with the proper gasket as well.
SPECS: Fits AR15/M4/M16 mil-spec upper receivers.
Nickel Boron baked on coating
Bolt – carpenter 158 steel, case hardened, shot peened, magnetic particle inspected.
Extractor – includes black buffer and spring.
Carrier – 8620 steel, heat treated, and case hardened.
Gas Key – properly staked grade 8 heat treated fasteners.
No Returns taken on used Bolt Carrier Groups.
Now you have an option to add the only lubricant/cleaner that sticks to Nickel Boron, which is FIRE Clean. This product is revolutionary on all moving metal surfaces, Direct impingement, suppressed and belt fed weapons. Works well on all surfaces and non-toxic. If you would like more than one bottle, type in "Fireclean" in the white search box to add more. You can also read more about it. Once you do and use it, you'll never use anything else on your weapons.