The barrel is one of the most critical components of your build. Spike's Tactical offers only high quality barrels so you can be confident that your rifle will be off to a great start.Features: Chambered in 9mm Luger with a 1:10 twist rate 16" length barrel 1/2x28 thread pitch Black nitride inside and out Weight: 1 lb 12 oz .750" gas seat diameter Tapered profile