This is a quickly improvised gun stand made from a wooden hand screw clamp.
Step 1: Clamp
Find a wooden hand screw clamp.
Step 2: Drill
Drill a hole in the bottom of one side.
Step 3: Dowel
Cut a dowel that fits into the clamp hole.
Step 4: Bench Dog
The dowel should also fit into a bench dog hole somewhere on your workbench.
Step 5: Stand
Place the dowel in the dog hole and in the clamp.
Step 6: Perch
Clamp the butt of the gun to ready for maintenance.