I am curious if you can post a picture... this would be more complicated and it is likely a challange best attempted with a Milling Machine. In as much, a good gunsmith or machinist might be best unless you are lucky enough to have your own mill in the garrage. There would be nothing to prohibit you from milling your receiver to SP-1 specs as long as you DO NOT DRILL the autosear hole... Drilling the hole for the autosear makes the receiver an M-16 (10-years in jail and $100,000 in fines for that little hole!)
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