RE: Mossberg 835 adjustment
I don't know about the 835 but the 500 you can get one with shorter slides for the youth models. I am short and have the same problem. Almost every rifle I own if I shoot it off hand my hand sits on the reciever or mag well. I do not like extended or removable magazines for this reason. And the bottom eject guns are deffinately out for me. I love the way brownings look, but can't deal with the bottom eject.
I don't know if you could modify one or not. I have only held an 835 once, let alone had one apart.
Paul