Nail guns, modified to shoot 22 bullets, are an alternative in the people’s republic where the right to keep and bear arms doesn’t exist. Human ingenuity in overcoming the gun-banners. I think the picture is of guns seized by some sort of police (I can’t read the Chinese). The whole story is here.
I do kind of admire the chunk of tree used for a stock on the center rifle.
Trego's Mountain Ear 