Got a Universal .30 Carbine-very good condition,but it is stove piping on me. Did a thorough cleaning & replaced the springs (took 4 hours to re-assemble without a special tool) but it still stovepipes. Got three different Clips but no change--using old military ammo, haven't tried new ammo yet--Did I maybe get something misplaced--the fireing pin doesn't seem to protrude as far as it should but it fires ok--just doesn't eject. Weak/strong recoil spring? Chamber looks clean & shiny--no indication of burrs---Help.