Extremely rare Factory Mossberg 500 Bullpup 8 + 1 "Riot shotgun" 12 gauge. Has very little wear. Very good condition. Not available anywhere. Iconic 12 gauge from Cinema & video games. Asking $2,500.oo Second rare unfired 5+1 Factory Mossberg 500 Bullpup. This is the original " short version". Amazing condition. Asking $1,500.oo. or Trade for equal value, in Dallas or DFW area.