These mags are now officially on my Crap list. Found out that when loaded to full 5 rounds the magazines (all four mags I bought) will not latch on when the bolt is closed. This is no problem for the 5/20 or 5/5 Norinco magazines. Only loading 4 will allow the magazine to latch on with bolt closed. Of course, this isn't a problem if you just load open bolt, but found something else, too. Sometimes the follower plate will get stuck bullet end first from time to time. I have no idea why this occurs. A good slap to the magazine get's it going again. It may just be my rifle, but I'm not really satisfied with them. They're still functional but I'm gonna sell them.