Introducing the Sharps Bros 365X-Improved slide" an improved alternative for the OEM Sig Sauer P365 slide. With its integrated three port compensator" the slide provides what Sharps Bros consider the ideal length for the P365. The Sharps Bros 365X-Improved slide is about 1/2" longer than the OEM P365/P365X slide and about .15" shorter than the XL or X-Macro length" a perfect balance of form and function.