My P-10C 15 round mags only have 1/16? gap between the top of the plate and the bottom of the grip on my P-07SR, and do not protrude past the bottom of the backstrap. My non-SR P-07 shipped with 15 round P-07 mags, so I don?t have any ?old style? mags for comparison, but I don?t see how it would affect concealability.