Restic (plastic resin, sprueless plastic... whatever you want to call it) cuts fine with a saw. I wouldn't try to just slice at it, though. Granted, I wouldn't do that to styrene, either, if I wanted a clean cut on anything thicker than a toothpick, but the material is definitely a bit tougher than you're likely accustomed to.
Have you checked out alternate sources for your guardsmen? That style of sci-fi trooper isn't exactly rare, after all. I'd recommend Mantic in a heartbeat for relatively inexpensive plastics, but restic is a pain to work with. It can be done, of course, but you may find it more than a little trying. If you poke around, you may even find models you like, just as they are, saving you the trouble of a weapon swap, entirely.
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