The Snapback cannon is an over-the-top beam weapon that kicks like a mule.
Primary fire shoots a large beam which knocks both the target and shooter back several feet, whilst secondary fire is a held beam which gradually accumulates power. The secondary fire can be difficult to handle, as it will gradually become more powerful and innacurate as well as kick the player back more and more. After a while, the power is too great to handle and the weapon overloads, killing its owner.
This was originally planned to be a 'proper' weapon, but in the end I ran out of patience with it. Hence, this version works in Instant Action matches only, and you can't play with it with your friends.