so, if you load one round and fire, does the gun eject the round and then the bolt remains in the open position? or do you manually have to pull the bolt to eject the round?? If you have to cycle it manually, ie pull the bolt to eject the round and chamber a new round then you got a gas system issue. If it fires ejects and gets stuck open, failing to chamber a new round, you have a firing group issue. figure out the issue first then look for solutions.