Faxon Firearms Duty Series Barrel Features The Faxon Firearms Duty Series barrel is machined entirely in house from 4150 CMV steel that has been fully stress relieved before rifling reducing the chance of warping under heat and sustained use. Button rifling cuts a conventional rifling pattern that accommodates cast lead ammunition as well as jacketed loads widening the range of ammunition a shooter can run through the gun. The 11 degree target crown protects the rifling at the muzzle and supports accuracy by giving propellant gases an even symmetrical exit. A 1/2x28 threaded muzzle at 4.5 inches allows the installation of a compensator suppressor or thread protector to suit the shooter s setup. Salt bath Nitride finish is applied to both the bore and the exterior increasing lubricity for smoother cycling while adding resistance to surface wear and corrosion over the life of the barrel. The barrel drops directly into factory spec Glock 19 Gen 2 through 5 19X and 45 slides with no gunsmithing or fitting required. Faxon holds tighter than factory tolerances on each barrel delivering a more consistent tighter lockup than the OEM barrel it replaces. This combination of fit finish and accuracy makes the Duty Series barrel a straightforward upgrade for Glock 19 owners for sale at GrabAGun. Faxon Firearms Duty Series Barrel Specifications Manufacturer: Faxon Firearms Model: Duty Series Barrel Compatible Hosts: Glock 19 Gen2-5 19X 45 Caliber: 9mm Barrel Length: 4.5 Color: Black Barrel Material: 4150 Steel Barrel Type: Button Rifled Twist: 1:10 Muzzle Thread: 1/2x28 Crown: 11-Degree Target Crown Finish: Black Nitride Available At: GrabAGun