Manufactured in-house, these barrels are fully stress relieved, air-gauge tested, and 11 degree target crowned to ensure superior accuracy.Quality is imbued into our barrels from the start. We start with the best materials, either certified 4150 Mil-Spec steel or 416-R Stainless. From there, each barrel goes through a battery of tests at each operation until finished in Nitride and final inspected. All barrels are individually checked for headspace by precision custom hardened gauges.Specifications: Barrel Material: 4150 Barrel Type: Button Rifled Barrel Caliber: 10mm AUTO Barrel Twist: 1:16 Barrel Length: 10.5" Barrel Profile: Pistol Caliber Taper Barrel Gas System: N/A - Blowback Inside Finish: Nitride Outside Finish: Nitride Muzzle Thread: 5/8x24 (Threads Per Inch) Gas Block Diameter: N/A Gas Port Diameter: N/A Gas Block Journal Length: N/A Barrel Extension: Glock(R) Magazine Compatible Weight: ~1.08 lbs 11-degree Target Crown