I went out with Pistol Pete, Alpha Cat, and Alpha cub to torture test AK47 polymer Mags.  If you're interested in all of the Mag testing watch from the beginning, if you're interested in the outdoor stuff fast forward to about 13:20.  We beet the crap out of the Mags to get failures.  We one-uped the MagPul drive over test on the 3 mags that survived to that point.