Problems? . . . 5 of us have been shooting the Xtrema 3.5 for a couple of years now, even shoot Trap. Skeet, and SP Clays with them to "keep in practice", THOUSANDS OF ROUNDS. None of us has had a problem other than when you FIRST starting shooting 2 3/4" light loads, it's a little stiff on ejecting them. About 30 rounds later, it's fine. Needless to say, normal waterfowling can be harsh as with any gun, but still no problems or mechanical failures.