I have owned a 500 for about 12 years now and have purchase a 20 inch brl for it.  I was in Wally World the other day and saw the Maverick on the shelf.  I was wondering if the Maverick and the 500 brls are interchangeable?  I was thinking about getting a rainy day gun to spray paint cammo.  I am looking used as well but around here the used 500s are the same price as new.  My original 500 has rather nice wood that I do not really want to cover up with paint.  Also, anyone had experience with the Mav.?