Went back to the range last nite and ran 200 more rds. thru my SA Combat ss. still won't feed properly and still hittin' me in the head with brass. I noticed my hits were off, looked down and the rear sight had moved. Grabbed it, and could move it back and forth, this is not good. Called SA today and complained, they said, "send it back". They're going to go over it, can't wait to see how it runs when they're done.