Rise Armament BCG .223/5.56 NIB – AR-15 Bolt Carrier Group

The Rise Armament NIB BCG is a nickel boron-coated bolt carrier group designed for AR-15 rifles chambered in .223/5.56. This carrier group delivers reduced friction, simplified cleaning, and consistent cycling compared to standard phosphate-coated BCGs. Shooters who run high round counts or operate in adverse conditions will appreciate the low-maintenance properties of the nickel boron finish, which sheds carbon buildup and requires minimal lubrication.

Manufactured from 8620 steel (carrier) and 9310 steel (bolt), the BCG features a complete nickel boron coating inside and out. The finish provides inherent lubricity and corrosion resistance. This is a drop-in component for mil-spec AR-15 upper receivers—no fitting or modification required. Includes gas key properly staked per mil-spec standards, extractor, ejector, and firing pin.

• Part Type: Bolt Carrier Group
• Compatible Firearms: AR-15, .223/5.56 chambered rifles
• Material: 8620 steel carrier, 9310 steel bolt
• Finish: Nickel Boron (NIB)
• Installation: Drop-In
• Includes: Complete BCG with gas key, extractor, ejector, firing pin