Easy to install drop-in design for the Hellcat Pro 9mm 3.7" Pistol. Not for the standard 3.1" Hellcat. Threaded version is notched for the Hellcat RDP Comp and will also work with most aftermarket mini and micro comps in 1/2x28. Threaded barrels include thread protector with tension lock o-ring. Advanced proprietary broach cut design specifically engineered for increased accuracy potential. Broach cut 6 groove rifling allows for all ammo types to be used safely, including cast lead. 100% Designed and manufactured in the USA with USA sourced certified 416R stainless steel. 9mm 1/10RH twist rifling. SAAMI spec chamber. Improved overall fit f Mfg: True Precision