Hi all,
I gave up on the "drop in" beavertails a long time ago. First because of the sloppy looking gap, second because I discovered that along with the sloppy gap I had too much side to side play to allow a consistent "let-off" of the safety. I fitted the Brown safety on my GM using eyes and files, and of course didn't get that nice even fit that the custom guns have. I then found that Brown and Wilson sell handy little jigs for cutting the frame for about $25 or so. Nice fit then, with a little touch up blue on non-stainless pistols. Regardless of what type of safety you put in, a little fitting to the trigger bow is usually needed. With some patience and restraint you'll end up with a beavertail that completely blocks the trigger until you have a grip and still looks good.
HP