Go on the street and drop it there for 1 day (don't forget to shoot looters), then return and pick it up again, lazy ass.
Or just shoot yourself a few times, then FA yourself. You'll look like a total badass, trust me.
But also, the muzzle of the sawed-off shotgun looks too smooth. It should look like it was actually sawed off with a rusty saw, not just made that way.