This unit replaces the magazine base plate on the SIG P365 (10 round magazines). This extension does not alter the capacity of the magazine. It adds approximately 5/8″ inch additional gripping surface (1/4″ longer than factory extension) as well as enhanced ergonomics. The enhanced griping surface also incorporates a texture which closely matches the frame of the firearm.
**Not for 365XL
Know all your state laws before purchase is made.