I've been in the market for a semi-automatic shotgun and came across someone selling a used Benelli M1014 (M4) Shotgun for $1100. It has a non-collapsible stock (but looks just like the non-collapsible one) and an American flag on the side. For a new M4 (the M11707 version), these would run $1550-$1750, so I think it' s a good deal.. Any advice? Anything I should watch out for or ask the seller? Thanks.