Looking for some AK gurus to point me in the right direction. Just picked up a used CAI MISR 10 that looks like it was picked up off the battlefield after being ran over by a tank. Went to test fire and racked the slide back and pulled the trigger and "click". Gun FTF first round. Racked slide again, "click". Same thing, won't manually feed. Re-inserted mag several times, finally got a round in the chamber. Fired gun and had a FTE/FTF. Tried another mag and same thing. Multiple FTF/FTE. GUN DID finally eject properly with no mag inserted when fired. Any suggestions?