I had the same problem with the stock GI grip safety, but the beavertail alleviates the problem. Rounding it is certainly an option, just a bit of dremmel work, though if you're not comfortable with doing the job or modifying parts on your 1911 (and have no experience doing so), I'd suggest having a gunsmith do it.
Another option is to pick up a drop-in beavertail. Chip McCormick makes such an animal. It's not 100% pretty as it's not designed to be fit to the gun, it's truly drop-in so there's a gap between the beavertail tang and the tangs on the frame. However, aside from a little rounding of corners that can be achieved with a file, this part will alleviate the thumb bite. (I installed one on my 1911 before biting the bullet and installing a proper beavertail fit to the gun.)
Dave
On Jul 5, 2007, at 4:37 AM, James Auld wrote:
The first time I took my Springfield A1 out to the range it rubbed two raw spots in my hand
between my thumb and index finger. I love shooting it, but don't like the punishment. Is it
reasonable to modify the NATO safety/beavertail such as chamfer the edges round? Is it that
it's still brand new parkerizing rubbing me the wrong way?