I'm planning to go to MUTC in a few months, going to be tons of fun but there's going to be a lot of enemy AFVs on both sides, with this in mind, I want to arm up with some anti tank weapons. Long story short, it looks like an under slung grenade launcher will be easier to lug around and most cost effective. I'm going to have a GP-30 grenade launcher so the barrel is a tad short. My question is what would be the best ammo to use? Rubber caps or foam balls or foam footballs if they can even fit.