since all the experts seem to be on this thread now i have 2- benelli m-4s for sale. what can i expect to be a fair price for the both of them? both have american one piece mag extention with them, both have pistol grip stocks. i also have a standard field stock for one and a benelli collapsible stock for the other. i relize condition is important but i shoot my guns so there're not BRAND NEW IN BOX. they are in great condition well taken care of, maybe 50-75 rds through them. any advise would be greatly appreciated