First time at range I had feed and eject issues. Releasing bolt would either not fully strip the cartridge from the mag, or the bolt would not fully chamber the round requiring a bolt assist action. When a round fired it may or may not eject.

I took it home, cleaned and lubed it. No change.

I am using the Korean surplus ammo, 15 rd factory mag, and a 30 rd KCI mag. Any suggestions would be greatly appreciated.