This may sound stupid but how to get to look at the gas ports? I got this shotgun in trade and I got no Manuel or anything with it except extra mags. I field stripped the gun and the puck is moving freely with very little residue in the gas tub.
edited to add: I took the gas plug off and can see that it has two gas holes venting into the gas tube. I guess the shotgun has seen no more that 50 rounds if that including what I fired today. here is a pick of the trigger assembly, ect.