Griffin ATM ( Advanced Threaded Match ) Barrels are billet machined from 416R stainless steel to exacting tolerances for the ultimate in drop in match performance. 5 axis machining done in a single work holding positions all critical dimensions on the breech ensuring theoretically perfect geometrical relationship of barrel, slide and locking lug. Hand polished chambers ensure optimal reliability with a wide range of ammunition from training to duty ammo. Two years of research and testing provided the appropriate knowledge to machine the barrel dimensions for a perfect fitment; providing the best possible accuracy without sacrificing any factory reliability. Designed with concealed carry users in mind, this barrel gives you the utility of accessory and suppressor support while providing uncompromising reliability. Don't lose confidence in your carry piece by using sub par components. Specifications for Griffin Armament Glock Barrel - Threaded, 9mm Luger, with Griffin Micro Carry Comp: Manufacturer: Griffin Armament Color: Black Finish: Black Nitride Fabric/Material: 416R Stainless Steel Threads per Inch: 1/2x28 Barrel Twist Rate: 1-10 Flutes: 6 Cartridge: 9mm Luger Gun Make: Glock Weight: 5.1 oz Included Accessories: Micro Carry Comp Condition: New Features of Griffin Armament Glock Barrel threaded 1/2x28 with Griffin Micro Carry Comp 416R Pre- hardened chromium stainless steel for peak accuracy potential through service life 9mm SAAMI-spec chamber Black Nitride finish resists surface wear & corrosion while providing increased surface hardness 0.5in-28 threaded muzzle for suppressor or accessory support Target crowned muzzle Honed and polished chamber to ensure reliable function across a broad range of ammo Broach cut rifling for reduced stress and uniformity of the bore All critical machining done in single work holding for exacting tolerances and manufacturing consistency from batch to batch. 1:10 twist rate Package Contents: Griffin Armament Glock Barrel threaded 1/2x28 Griffin Micro Carry Comp