I'm in MCJROTC, and I'm looking to buy the guns we use in Drill Team...?

Okay, so the gun I'm looking for specfically is black, weighs about 12 lbs. I don't necesarily need to buy the ACTUAL gun since the school provides those, but I at least need a similar practice rifle. I don't know the name of the rifle, and I don't know much about it, except the fact that it isn't a real, usable rifle, but one we use in Drill. So if you know where I can buy one of those, either the real or the practice, that would be AMAZING. Thanks!!