"The ammo's a unit about so big-" He indicates an object smaller than an apple. "Looks a little like a grenade. Mostly white and metallic grey. Hold it to this port here and wait for it all to go grey, then drop it. The change means the charge was absorbed. The actual fired energy ball is about the size of a man's fist. Glows a couple of different colors. Bounces off metal and concrete walls and the prison floor Alyx and I were breaking her father out of."