TacFire BU-556-16 is a complete AR-platform upper assembly built around a 16" 5.56x45mm NATO black nitride barrel with a black anodized receiver and an M-LOK handguard for modern accessory mounting.

Key features

• 16" 5.56x45mm NATO barrel with black nitride treatment
• Black anodized receiver for a consistent dark finish
• Complete upper assembly configuration for AR-platform builds
• M-LOK handguard for direct accessory attachment

If you’re assembling or upgrading an AR with an M-LOK front end and a nitride-treated 16" barrel, the TacFire BU-556-16 complete upper is a straightforward option.