The TRUE drop-in ready barrel for the Sig Sauer P365 designed for the 3.1″ P365 SAS X (3.1″) P365-AXG Legion Spectre Comp & XMACRO Comp (3.1″) version only 9mm models (also available for P365XL and standard XMACRO 3.7). TRUE barrels deliver unmatched accuracy combining advanced cuts chamfers and feed ramp designed to outperform OEM standards and to ensure reliable feeding of all types of ammunition designs including defensive ammo.