i quized my daughter atour last meeting about her shotgun and she carries a mossberg 12 gauge. she has to release the trigger each time for the gun to fire. i have a 12 winchester trench gun that you just hold the trigger and it will shoot as long as you pump another one in the chamber. my ithaca is the same way. it doesnt make sense to not have this feature on a military shotgun, especially considering their job is to protect this country. she is a master of arms on the carrier jfk, 3rd class petty officer. needless to say i am proud of her even if she does have to carry some weapons of questionable design.