TacFire BU-556-10 Pistol Upper Assembly 5.56x45mm NATO Caliber with 10" Black Nitride Barrel, Black Anodized 7075-T6 Aluminum Receiver & M-LOK Handguard for AR-Platform Includes Bolt Carrier Group

The TacFire BU-556-10 Pistol Upper Assembly in 5.56x45mm NATO is a complete, ready-to-function upper receiver designed for AR-platform builds requiring a compact, maneuverable configuration. Built around a 10-inch black nitride barrel and machined from 7075-T6 aluminum, this upper delivers the ballistic performance and mechanical reliability demanded in law enforcement training, home defense preparation, and close-quarters operational scenarios. The assembly ships complete with bolt carrier group, eliminating the need for separate component sourcing.

The 10-inch barrel length in 5.56 NATO maintains velocity suitable for duty distances while reducing overall platform length below rifle-length gas system thresholds. Black nitride coating provides corrosion resistance and improved lubricity during cycling, critical for sustained fire strings and extended storage. The 7075-T6 aluminum receiver is aircraft-grade material widely specified in military and law enforcement platforms for strength-to-weight optimization. The integrated M-LOK handguard accommodates industry-standard tactical accessories—optics mounts, lights, lasers, and foregrips—without rail system weight penalties.

This upper assembly suits shooters building tactical carbines, duty-configuration AR-15 platforms, or compact training rifles. The 5.56x45mm NATO chamber ensures compatibility with military-specification ammunition and modern commercial loads. At 4 lbs, the upper reduces handguard oscillation and improves weapon handling in high-round-count training cycles. Operators requiring a sub-carbine AR upper with proven materials and straightforward installation will find this TacFire model a capable, cost-effective component for either civilian or professional use.