had a new mossberg 590a1, took it to the range the first time, the pump jam about every 5 or 6 round, is this normal for an new shot gun? do they require an break in period? i also notice the factory gun is quit dry , not lube properly, the jamming happens when i try to slide back and eject shell, just dtuck there, very strange, has any one got an mossberg 590 series knows how to fix this problems? thanks
