Do you even know what an AOW is?
This is a cadiz .410 AOW. Same thing on a 12 gage but you need to start with an RPK blank instead. Smooth bore pistols are AOW's and do not require a forward grip although they may use one. Cadiz's price on a 12 or 20 gauge AOW 12" barrel is $1825. Posties ( Post 86 dealer sales samples ) are machine guns. AOW's are not machine guns.