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. FEATURES PROUDLY MADE IN THE USA!! 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) Exacting tolerances allow for drop in installation Fluting creates path for heat and debris to escape Mfg: Lone Wolf Dist. Threaded 9/16 x 24, thread protector included.