Rock River Arms Completed Upper Receiver Entry Tactical A4 .223/5.56mm 16 Inch Barrel 1-9 Twist 1/2-28 Thread R4 Handguard A2 Flash Hider Black

Rock River Arms

Resumen

The Rock River Arms Completed Upper Receiver Entry Tactical A4 is a fully assembled upper designed for the AR-15 platform, featuring a 16-inch barrel optimized for 5.56 NATO caliber. With a 1:9 twist rate, this barrel provides versatility in stabilizing various bullet weights, making it suitable for a range of ammunition types. The A4 receiver style, combined with a 1/2x28 thread pitch, allows for easy attachment of muzzle devices, ensuring that this upper is a solid choice for both tactical and sport shooting builds.