If it’s an oem + base plate, it gives you 1 round in .40, & .357 sig. 2 rounds in 9mm.G27 with a plus 2 extended mag and a G22 mag. At least I think it is a plus 2 mag, it may be only a plus 1. Can't remember right off. It gives me a place for my little finger though and doesn't print. Love the 40 cals, especially the Glocks.