Zev Technologies Glock Barrels. Enhanced features include a recessed target crown, a new match chamber, and a stylized barrel hood with caliber and model engravings and a loaded chamber indicator. ZEV's proprietary broach cut 1 in 14” left hand twist rifling was developed to create the most accurate Glock aftermarket barrel available, and testing confirms a significant increase in accuracy over factory barrels in all standard bullet weights. Manufactured from 416R stainless steel which is an ideal material for making match grade barrels because the material allows for the precise cutting of chambers and rifling which results in a more accurate barrel.