some people need a little dose of reality

Even Shadowrun has aspects of it and it is a sci-fi/fantasy game

After all, your characters don't float around, so there is still laws of gravity and conductivity, and what not...
sure, they throw in cool weapons like lasers, but they still also work on a (semi) scientific basis.

Just pointing out to the OP that even though he can replace the entire casing of the gun in plastic composites, there are still several fundamental parts that NEED to remain metal and silicone for the weapon to work. Such as the battery, the charger, and the emitter.