Projectiles and shaders

[SimonKTemplar]

My question is this: is it possible to assign environment maps (like cm_baremetal or similar ones) to weapon projectiles? I don't know if projectiles are models or simply sprites, but what I'm trying to do is make the sonic weapon projectiles use the cloaking device shader (the transparent thingy you see on a player when you activate a stealth field generator). I want to make the sonic projectiles look more like the projectiles fired by Geonosian sonic blasters in AOTC.