Many years ago, to prove the futility of gun control, a couple guys decided to build a revolver in their well l basement machine shop. I think they had a Atlas 6" or 10" metal lathe as their most complex machine. They made and test fired a revolver in some ungodly caliber like Weatherby 338 or 378. They did it and it passed test firing. Their point was that if a hobby home shop, with a non trained persons, could make from scratch a gun like that it was pointless to think any amount of gun regulation would or could end guns. Then they destroyed the gun.
