Quote Originally Posted by Brit plumber View Post
sight blanking plates
We pulled three cut receivers out of a pile of lots and found one M2 with sight slots...so I made an M2 ground mounted out of it. The other two were M3 with no provision for sights. Yes, they were intermixed. Also there would be internal differences like the trigger bar and trigger bar stop adjust nut being absent because the M3 used a sideplate trigger... Hadn't thought about this stuff for years.