I don't see why not. It would be a conversion, so as long as you tell your opponent what it is you should be ok. On my models I also use a color coding system in the end of the barrel. Flamers, lascannon, multi-lasers and lasguns/pistols are red. Melta weapons are Ultramarine blue. Plasma weapons are Dark Angels green. Bolters, heavy bolters, bolt pistols and Autocannons have black tips. This makes it easy to tell what they are at a glance.
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