Ice Guns

One weapon I really want is an ice gun like Mr. Freeze's. I like that it's very versatile, so you can use it to trap enemies, kill them, create walls, make platforms and many other things. I think I would want either a big rifle that's not connected to anything, or a relatively large pistol that's connected to a larger unit on either my belt or my back (I fon't really want a full suit of cold armor). I think a small independent pistol is just unrealistic and I would be afraid of losing it.