[Eul0gy]

I've looked through the forums and saw quite a few posts like this and one pretty much exactly like this but it was no help to me.

I am using duster gas in a KSC Cz75. I realize that it is very cold here and GBB's hardly work in the cold weather but after emptying the magazine the slide will not lock back. Could it possibly be that the duster gas can't push the slide back far enough to lock? Do I need to use propane? The gun has a plastic exterior, as some/many of you know, would propane be to harsh on the internals?

Hope someone can help! Thanks!