True Precision match-grade drop-in barrel with proprietary broach-cut rifling - a clean, accurate barrel that drops into Springfield Armory Hellcat Pro pistols with no fitting work. Features: Fits Springfield Armory Hellcat Pro pistols, 9mm Luger Material: certified 416R stainless steel broach-cut 6-groove rifling, 1:10 RH twist Broach-cut bore runs all ammo types safely, including cast lead Chamber: fully supported SAAMI-spec 1/2x28 threaded muzzle - Viton high-heat integral O-ring lock thread protector included Finish: TiN gold Drop-in fit - no gunsmithing required Finish note: The TiN coating will show wear at metal-to-metal contact points - primarily the locking lug face and barrel hood - over time. This is normal and does not affect function or accuracy. Hand-cycle a few dummy rounds to confirm headspace and feeding before live fire. Thread the protector (or your muzzle device) finger-tight against the shoulder.