TRUE's drop-in barrel for the Sig Sauer P365-FUSE 4.30 inches 9mm models is crafted for shooters who demand peak performance. With advanced chamber designs, an optimized feed ramp and superior stainless steel broach cut rifling, this barrel enhances accuracy and reliability beyond OEM standards. Experience precision engineering built for those who expect the best. 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