Flareguns and convertions

[General Pain]

Me and DeCorba had a discussion regarding converting a flaregun; spesifically a 4 gauge 3 barrelled japanese flaregun from WW2; into a closecombat shotgun. It would offcourse be made of steel and not aluminium - and the range would be short and recoile probably massive - but what would damage be with slug and buck? (yes I know depending on the buck there would be various results)

Your thoughts...

http://members.shaw.ca/ursacki/fgflareguns.htm


what would damage be from a normal flare?