I also have this problem like many others and I have thought of a possible solution in my case but wanted to get some feedback from you guys as to whether I am missing something. My plan would be to remove a small amount of metal (marked in red in the second picture) the same width as the gap and then elongate the holes for the bolts so they still line up with the barrel nut. Does anyone see any potential problems with this. If it does work then hopefully it will help others like the OP.
Adam
http://smith-wessonforum.com/attachm...1&d=1490614853
http://smith-wessonforum.com/attachm...1&d=1490614910