I'm sure it can be done quieter, but to take your pump down and then all the way back up again to chamber a round is gonna make some noise. I dont see why anyone would waist time sneaking around but that's you. I can respect how you do things. All I'm saying is if I was snooping around somewhere where I wasn't supposed to be and I heard the unmistakable sound of a pump shotgun, I would quickly be on my way!
