It does appear to me to be a no4 mag, I think just a really crappy knockoff. Also notice the sanding marks all over it... ?










It's this one below that I am hoping shows the problem I think I have. The top left side of the mag is so much higher than the right. The left seats up against the receiver bottom flush, the right side doesn't come close, and the whole thing hangs too low and as mentioned previously won't latch...

At any rate, the bolt barely strips a cartridge off, sometimes going over top of the rounds. When it does strip one it rams it nose first into the bottom of guide rail and goes nowhere.