If it were me: I'd set a really low cash bar, say $80. Then I'd Mad Max it. Grab a lost military sporterized stock, fabricobble a pistol grip onto it, make the buttplate from an antler...or a chevy bumper...or a flip-flop 'jandal'...or a tire...then I'd dip the action in hydrochloric to clean the pits, then I'd kill the acid and fill the pits with jb weld, sand it smooth, paint the whole thing with bake on enamel, toss it in a hot car for a couple days, then glass bed it, weld on a skull or a nut or a shifter or something like that for a bolt handle, etc etc. Spraypaint the stock with leaf stencils. Maybe attach some pygmy scalps for ambience. The teeth of slaughtered buffalo. Kill notches. A sling made from knotted rags. Wire inlays ripped from a motor. Sling mounts from fencing wire.

I'd rebarrel it to something more common too. The toughest part would be choosing between 'dusty jihadi' or 'bubba's blind cousin'.