TRUE's drop-in ready barrel for the Sig Sauer P365-FUSE 4.30 inches 9mm models offers superior performance with every shot. Featuring enhanced chamber geometry, a refined feed ramp and precision-engineered rifling, it guarantees smooth, reliable feeding and unmatched accuracy. Made from proprietary stainless steel with broach cut rifling, it's the perfect upgrade for serious shooters. The USA-sourced certified 416R stainless steel ensures exceptional barrel strength and precision Does not retain the LCI cut-out, maintaining a streamlined design The proprietary broach-cut with a 6-groove, 9mm 1:10 RH twist ensures optimal barrel rifling, providing superior accuracy and consistency while being compatible with all types of ammunition, including cast lead, for enhanced versatility and performance