How is this possible normal Gatling 150/600?

While playing HM someone asked if they could swap their gatling gun with 150/600 with my RPK gold.I thought that can't be(normally 150/450 is maximum with mutation mag and MG mag),but i swapped anyway. Heres the screenshot.
Crossfire20110409_0002.jpg

I read on another post that if someone wins a mutation mag from m60adv crates its possible to have 2mutation mags.

http://forum.z8games.com/showthread.php?p=2066330#post2066330

But i would of thought if you won another mutation mag that they would just stack or only let you equipt one. Anyone got an explanation of how this is possible?

The only explanation i can think of is that items won in BM crates don't stack with items bought from mall/item shop.

Example here:

crossfire2010-12-2423-38-28-65.jpg

Then it is possible to have 2mutation mags and equipt them both while playing HM but this has to be a bug surely.

I was thinking now about buying lots of M60adv crates just to win these mags and then i can have 120/480 on RPK gold :).

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