Tactical Kinetics Barrel AR-15 .350 Legend 18in Medium Contour Carbine Length Gas 1-16 Twist Black Nitride. Every barrel is precision instrument-inspected for absolute straightness and air gauged for maximum uniformity yielding the highest accuracy possible. Land and groove tolerance from breech to muzzle can vary only .0001" for the best concentricity. When using factory loaded SAAMI approved Match Grade ammunition you can expect 1 MOA level accuracy (or better) out of TK AR15 barrels at 100 yards. Keep in mind that headspace component selection assembly methods external variables such as the shooter environmental conditions and ammunition will all have an impact on group sizes. TK only recommends that you use factory new SAAMI approved ammunition in TK barrels. Tactical Kinetics stands behind their barrels performing 1 MOA (or better) when Match Grade ammo is used. Tactical Kinetics AR15 barrels are then coated in Nitride or Ferritic Nitrocarburizing resulting in significantly improved surface properties on ferrous metal parts while maintaining dimensional and shape stability. Nitride yields increased wear resistance improved fatigue strength better corrosion resistance improved lubricity and enhanced cosmetic appeal. Specifications for Tactical Kinetics AR-15 Barrel: Manufacturer: Tactical Kinetics Color: Black Finish: Nitride Barrel Profile: Medium Barrel Material: 4150 Chrome Moly Vanadium Flutes: No Gun Make: AR Platform Gun Model: AR-15 Weight: 1.5 lb Condition: New Features: Laser Marked M4 feed ramps for reliability Air Gauged tested for consistency Thread pattern to fit standard AR-15 muzzle devices 11 Match crown for increased accuracy Bottom dimple for easy gas block install and alignment Package Contents: Tactical Kinetics AR-15 Barrel What firearm models does the manufacturer say Tactical Kinetics AR-15 Barrel is compatible with? The manufacturer says that Tactical Kinetics AR-15 Barrel is compatible with AR-15Tactical Kinetics TK1851: Barrel AR-15 .350 Legend 18in Medium Contour Carbine Length Gas 1-16 Twist Black Nitride