Drop-in 9mm threaded barrel for the Springfield Hellcat Pro 3.7" pistol. Will not fit the standard 3.1" Hellcat - verify your model before purchase. Manufactured by True Precision outside Atlanta, Georgia from US-made materials and finished in Black Nitride for long-lasting corrosion resistance and reduced friction at the locking surfaces. Specs: Caliber: 9mm Luger Pistol fit: Springfield Hellcat Pro (3.7" only - not the 3.1" Hellcat) Threading: 1/2x28 - accepts standard 9mm compensators and suppressors Rifling: Broach cut, 6 groove (cast lead, FMJ, JHP all safe) Finish: Black Nitride Includes thread protector True Precision's broach-cut rifling is engineered for tighter accuracy potential than standard button rifling and is rated for unjacketed lead - useful if you reload or run cast for range work. Drop-in design with no fitting needed on a factory Hellcat Pro slide. Run 100-150 rounds of FMJ before installing a compensator or suppressor to confirm fit and headspace, and verify your zero after any muzzle device install.