Andro Corp Complete Upper Features The Andro Corp Industries Complete Upper is chambered in .300 Blackout and built around a 10 barrel machined from chrome moly vanadium steel a material chosen for its combination of strength and heat resistance under repeated firing. A 1:7 twist rate is matched to the .300 Blackout cartridge s wide range of bullet weights stabilizing both lighter supersonic loads and the heavier subsonic projectiles the cartridge is popular for. This twist rate flexibility makes the upper a strong choice for shooters who run both supersonic and suppressed subsonic ammunition through the same rifle. The compact 10 barrel length keeps the overall platform short and maneuverable well suited to close-quarters and home defense applications. An M-LOK handguard wraps the barrel giving shooters attachment points along the full length of the forend for lights foregrips bipods and slings without needing separate rail sections bolted on. The barrel is threaded to the common 1/2x28 pattern letting shooters install standard .300 Blackout muzzle devices flash hiders or suppressors directly without adapters. As a complete upper the build arrives ready to drop onto a compatible AR-15 lower receiver speeding up assembly for a home builder. For shooters looking to add a dedicated .300 Blackout upper to their AR-15 lower the Andro Corp Industries Complete Upper is a direct ready-to-install option. Andro Corp Complete Upper Specifications Manufacturer: Andro Corp Type: Complete Upper Caliber: .300 AAC Blackout Barrel Material: Chrome Moly Vanadium Twist: 1:7 Handguards: M-LOK Thread Pattern: 1/2x28 Barrel Length: 10 Available At: GrabAGun