Maybe it's a dead rat. I am not inclined to shoot something that rough.
Or, if not too far gone, then maybe its time to tickle that fancy for restoring a 99. Heck, it looks like there are a fair number of smiths out there who make good trade on restoring Winchesters and Marlins, so why not a 99? Done right, it would give the old rifle a new lease on life.
Here's another twist on restoration. You are a Hot Rod kind of guy. Get it back in good working order and call it a Rat Rod!