This site says it will take all AK mags and 75 rnd Drums !
http://en.wikipedia.org/wiki/AK47
Mags do not fit tight in any AK, hence they Rattle somewhat,It may not be the Magazine, it may be the Receiver "Spreading" or worn a bit around the Mag well.
Don't try to weld the Mag, not worth the effort or worth ruining a mag, since you can buy mags for 12 bucks or less, try a new mag and see how it fits. IF a mag functions properly, what more could you want ?
Rich