I understand it should fire light rounds worse on one but thought id try and see if it id any better. I have fired about 75-100 rounds so far through it. i started with 3in oo bk which fired fine but the second I switched to the 2 3/4 bird loads it jammed every other shot. I can only feel 1 maybe 2 ports in the gas block so i contacted Cadiz Gun Works and will be sending it to them i guess.