my mossberg 500 has jammed every single time i shot it for the last 16 rounds. i guess its my fault for mixing canadian (lakefield) parts with usa made parts, the specs just seem to be a little to different. ive also had my old weatherby vanguard jam up alot. had the safety feeze shut on it to but thats also my fault. my .303, 10/22 and cooey .22 are the only 3 guns i can count on every time i pick them up.