B.A.D. AR15/M16/M4 Bolt Carrier Group | Full Auto | Nitride

B.A.D. AR15/M16/M4 Bolt Carrier Group | Full Auto | Nitride

The Battle Arms Development AR15/M16/M4 Full Auto Bolt Carrier Group is a premium Mil-Spec component engineered for dependable performance, long-term durability, and smooth cycling across AR15-pattern rifles. Featuring a full-mass M16 carrier, a 9310 steel MPI-tested bolt, and a deep Black Nitride finish, this BCG is built for shooters who demand reliability in duty, defensive, and high-volume training environments.

Mil-Spec Construction With Enhanced Materials

The carrier is machined from 8620 steel and treated with a Black Nitride finish for improved hardness, corrosion resistance, and reduced friction. The bolt is crafted from 9310 steel, properly heat-treated, shot-peened, and individually Magnetic Particle Inspected to ensure structural integrity. A chrome-lined interior, properly staked gas key, and tool-steel extractor further elevate durability under demanding use.

Full-Mass M16 Carrier

The full-auto carrier profile provides increased reciprocating mass, supporting smoother cycling, improved bolt lock, and reliable function with both suppressed and unsuppressed setups. While full-auto capable, the carrier is fully compatible with standard semi-automatic AR15 builds and is often preferred for its enhanced reliability characteristics.

Features

• Full-auto rated bolt carrier group for AR15/M16/M4 platforms
• 8620 steel carrier with Black Nitride finish
• 9310 steel bolt, heat-treated, shot-peened, and MPI tested
• Chrome-lined carrier interior and gas key channel
• Properly staked gas key using Grade 8 fasteners
• Tool-steel extractor for consistent extraction
• Full-mass carrier for reliable cycling in all configurations
• Made in the U.S.A.

Compatibility Notes

• Fits all Mil-Spec AR15/M16/M4 upper receivers
• Full-auto carrier profile is 100% compatible with semi-auto rifles
• Not compatible with blowback 9mm, .40, .45, or PCC-style AR uppers
• Not compatible with 7.62×39, 6.5 Grendel, 6mm ARC, or other non–5.56 bolt faces
• Requires a 5.56/.223/300BLK compatible barrel and gas system
• Will not function in AR-10 / LR-308 receivers

Why Builders Choose This BCG

The BAD Full Auto Nitride BCG is a dependable, high-value upgrade for builders who prioritize durability, clean operation, and Mil-Spec reliability. With enhanced steel selection, Nitride treatment, and proper staking, it offers the long-term performance shooters expect from a duty-ready bolt carrier group. Whether outfitting a new AR15 build or replacing a worn carrier, this BCG provides the rugged construction and smooth performance Battle Arms Development is known for.