Well, I'm thinking shotguns again. I like the 870, but I don't like it's higher price, slide release location or safety location. That turns me to the 500. I like the 500, except I don't like the 24" barrel for a rifled barrel. So, how much/ how hard would this be to shorten to 18.5 inches? Can I do it and still get decent accuracy? or shoud I go to a gunsmith? Also, same for mounting a scope base to the top of it?