Alpha Wolf barrels establish the benchmark for absolute accuracy and combat reliability. It is the pinnacle of what every other barrel manufacturer strives to be. Exact tolerances allow for a drop in installation. Designed for lead, plated, or jacketed ammunition. Heat treated to RC 40-42, then Salt Bath Nitride coated. FEATURES PROUDLY MADE IN THE USA!! Fits all Glock generations. Designed for lead, plated, or jacketed ammunition. Certified, stress relieved 416 stainless steel. Button rifled, three stage honed bore. Industry recognized SBN premium coating (SBN is Salt Bath Nitride, similar to Tennifer) Heat treated to RC 40-42, then SBN co Mfg: Lone Wolf Dist.