what the main difference between the ''140 [bolt action]-150''[ semi automatic] ''vs the ''340[ bolt action ]-350'' [semi automatic]series .22 mossbergs?triggers-barrels-stocks?are they all about equally quality-reliable -accurate?or is one more favourable than another-and if so-why?[I've got a couple-and like them-one in the 140 series and the other in the 340 but can't see any real diference ]