Replaces the standard Sig Sauer P365 XL and P365X magazine floor plate with a rail adapter so you can attach the MantisX to your firearm if it doesn't have an existing rail, or if you want to work with holster draws . Note, this MagRail is not compatible with the following magazines (consider the Universal MagRail adapter ): P365 P365 XMACRO P365 FUSE Two variants: 12-round (MT-2067), 15-round (MT-2068)