Faxon Firearms Duty Series Barrel Features The Faxon Firearms Duty Series barrel is button rifled and fully stress relieved from 4150 CMV steel machined 100 percent in house at Faxon s own facility rather than outsourced. Conventional rifling allows the barrel to run a wider range of ammunition than many aftermarket barrels including cast lead bullets that some rifling styles struggle with. An 11 degree target crown protects the rifling at the muzzle and supports consistent accuracy shot after shot. The 1:10 twist rate is matched to the 9mm cartridge delivering reliable stabilization across common bullet weights. A black salt bath nitride finish coats the barrel increasing lubricity extending barrel life and adding resistance to surface wear compared to an untreated bore. The barrel is threaded 1/2x28 at the muzzle opening compatibility with suppressors and muzzle devices built to that common pistol thread standard. Designed as a drop in replacement this barrel fits factory spec Glock 17 Gen 2 through Gen 4 slides with better than factory tolerances for a consistent tighter lockup than OEM. Pistol owners looking to add threading or simply upgrade barrel quality on their Glock 17 will find this barrel installs without any gunsmithing. Faxon Firearms Duty Series Barrel Specifications Manufacturer: Faxon Firearms Model: Duty Series Barrel Caliber: 9mm Compatible Hosts: Glock 17 Gen 2-4 Barrel Material: 4150 CMV Barrel Profile: Drop In Twist Rate: 1:10 Rifling: Button Rifled Conventional Crown: 11-Degree Target Crown Finish: Salt Bath Nitride Color: Black Muzzle Thread: 1/2x28 Barrel Length: 4.49 Available At: GrabAGun