True Precision TPP365XLBXG : TRUE offers its drop-in ready barrel for the Sig Sauer P365XL, designed for the 3.7\" P365XL, XMACRO, & Tacops 9mm models (also available for P365, 3.1). 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.