@40mm. The simplest I can think of is a 'L' hook mounted horizontally, the hook entering the muzzle. Black shrink wrap the tip, paint the shaft of the 'L' hook same as your wall.
And a similar hook mounted through the trigger guard in such a way it both holds the gun up and also keeps it going backwards off the front 'L' hook. Again, be creative blending them in with those little tins of Humbrol left over from doing AirFix planes, tanks and Bofors when you were a boy.
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