I had this done to a customer of mine awhile back...
http://www.calguns.net/calgunforum/s...d.php?t=456187
easy fix... so easy dont laugh now...
just drill it thru than aluminum black it...
the top and bottom fit but pin wouldn't so i got same diameter drill bit of receiver hole and slowly made my way thru... presto pin fit with no other problems...
and honestly really doesn't matter what upper and lower you have that's not going to solve the problem at hand...