Grey Ghost Precision GGP320 Full Size Barrel Features The Grey Ghost Precision Barrel is machined from 416R gun barrel quality stainless steel a material prized for its combination of strength and corrosion resistance under repeated firing. Match grade chambering in 9mm is cut to SAAMI specifications and held to a tight plus or minus 0.003 inch final dimension which keeps chamber to bore alignment consistent from barrel to barrel. The 1:10 twist rate is tuned for the common bullet weights fielded in 9mm pistols stabilizing projectiles for reliable accuracy at typical defensive and range distances. As a drop in replacement for the Sig Sauer P320 Full Size installation requires no gunsmithing or fitting work. A threaded muzzle cut to 1/2x28 opens the door to suppressors compensators and other muzzle devices giving P320 owners the flexibility to configure their pistol for competition or home defense use. The black nitride finish adds a layer of wear and corrosion resistance beyond bare stainless steel helping the barrel hold up to extended range sessions and humid storage conditions alike. Grey Ghost Precision s team draws on extensive military and manufacturing backgrounds to refine every dimension of its pistol components. Built to be accurate reliable and attainable this barrel is a straightforward way to extract more precision from a duty or range P320. Grey Ghost Precision GGP320 Full Size Barrel Specifications Manufacturer: Grey Ghost Precision Model: GGP320 Full Size Barrel Caliber: 9mm Compatible Hosts: Sig Sauer P320 Full Size Material: 416R Stainless Steel Finish: Black Nitride Thread Pitch: 1/2x28 Twist Rate: 1:10 Tolerance: +/- 0.003 Barrel Length: 4.7 Available At: GrabAGun