My Chinese military SKS that I bought probably some 17 years ago from Century Int'l when they were still around, came with that type of mag installed. I was a little bummed when I got it because it ostensibly wasn't issued that way, though it WAS serialed to the gun. I've since replaced it with a 10/5 style (sorry, since it's numbered to the gun I'm not selling it) but I do recall it never game me trouble feeding.