Stupid ideas???? Those r the kind that make life fun and keep the stress level down.
Degrease w/a good degreaser. The Gunk green stuff in the squirt bottle works well.
The rifle in the snow had had that finish for 2 winters now and is holding up way better than expected with that craft paint applied by an airbrush.
I took the metal parts to the local airport and sand blasted it to see what that would do. Turned out to be unnecessary but it was fun.
I airbrushed the metal to match the local semi-snow/grass/sage brush background. The stock was airbrushed with a base lighter colored base coat. Then sprayed with a darker layer or maybe it was the other way around. I then used a small brush to do the russian olive branch affect.
Give it a go. There ain't much of a way to mess up an shot gun.;)