If you want a gun with a broken horn, or plastic buttplate, or the toe missing from the buttstock, go ahead and bang the stock against the floor. However, at the factory, they bump the muzzle end against a piece of carpet or plywood hung on the wall for just this purpose.
I usually tell people to put the muzzles into either the carpeted floor or, better, into the toe area of one's shoe while while holding the barrel/buttstock middle section with your weak hand, and using the meaty part of your free hand to give the buttplate a karate chop. The nerve endings on both your foot and your hand will keep the violence perpetrated to the breakable things within reason, using this method.
I still can't see the photos.
Best,
Ted