A couple of thoughts on an arched backstrap..................

The Hogue rubber and wood 39xx grips already have a arch to them.....while slightly thicker than factory.... they IMO "fill" your hand better and have had no practical effect on concealment for me since 1992..... especially the wood models.


Second...... ever thought of building up and reshaping a 39xx grip?? Not sure what kind of material you could use ( why does the word "Bondo" come to mind) then Dremel/sand it down to get the arch you want.


FWIW I'd keep the slide stop...... you could just slim it down to where you had to slingshot the slide on a loaded magazine.

Edit: forgot; I think you need to find one of the rare true "flush fit" ,steel baseplate, 7rd magazines.