Rifling in an AR barrel is one of the most important features for shooting accurately. Somehow this hasnt been the focus on shorter barrels for the pistol marketuntil now. Were using a process that utilizes our lone rifling technology. Were utilizing a single point cutting technique for greater precision and ultimately, much better accuracy. Our concentricity to the bore is unmatched and shows in the shooting experience. Run it harder, faster and more accurately with the Fortis Glock line of barrels. Fits the G19 Gen 1-5 and also fits the 19X. Specifications for Fortis Manufacturing Glock 19 Match Grade Threaded Barrel: Manufacturer: Fortis Manufacturing Fabric/Material: 416 R Stainless Steel Barrel Length: 4.5 in Threads per Inch: 1/2x28 Barrel Twist Rate: 1-10 Caliber: 9mm Luger Gun Make: Glock Gun Model: Glock 19X, Glock 45, Glock 19 Weight: 3.8 oz Condition: New Features of Fortis Manufacturing Glock 19 Match Grade Threaded Barrel Ultra precise concentricity to the bore Lone Rifling technology yields identical grooves 11 degrees Target Crown Compatible with Glock 1-5 as well as Glock X Package Contents: Fortis Manufacturing Glock 19 Match Grade Threaded Barrel Threaded barrel protector (protector is black nitride) Which weapon models is Fortis Manufacturing Glock 19 Match Grade Threaded Barrel compatible with? Fortis Manufacturing Glock 19 Match Grade Threaded Barrel is compatible with Glock 19, Glock 45, Glock 19X