The gun is only available in 9mm, but the P320 series, in general, can be customized and converted to a variety of calibers. (mm is the perfect round for compact guns in my opinion, and this makes the XCOMPACT easier to shoot and it utilizes ammo that’s affordable and common.
Shop for cheap price Pachmayr 03889 Grip Extender Sig Sauer P320 Sub Compact And Sig Sauer P320 9mm Slide .