I have a pbr I've been wanting to build up. I got a McMillan a3 stock that's supposed to be inletted for an spr thinking that they would be the same, but when I tried putting my bottom metal in the front mounting hole it didn't fit and to make it worse when I took it to the smith he said it can't be milled more. He said it is inletted for a Winchester which confused me even more.I looked at maybe aftermarket metal but don't know if that would work either. Any help or clarification would be greatly appreciated.