ZEV Technologies ZEV Optimized Match Glock 34 Gen5 9mm Threaded Pistol Barrel 1-14 Twist 1/2x28 PVD Bronze BBL-34-OPT-5G-TH-BRZ. ZEV s proprietary broach cut 1 in 14'' left hand twist rifling was developed to create the most accurate Glock...