I tried a friends Colt Commander that had a drop in beavertail, and I hated it. 7 rounds and my hand was red and getting chewed up from the grip safety. I got a SA WW2 GI, and the hammer bite wasn't a problem, but my web of my hand would get very red and irritated from the grip safety, so I knocked the corners off, but that didnt help. I finally broke down and got a chip mccormick hammer and sear, and a S&A beavertail with the palm swell and fitting jig. It took about 2 hours with a mill file, Dremel, sanding drums and needle files, but now it feels soooo much more comfortable. The jig and beavertail were like $55 plus shipping, and you can bob your orig hammer to save on that end. Well worth it in my book!