Thumper

The thumper is a new grenade launcher introduced in the Grenade Fest update on May 28th, 2014 as a exclusive weapon similar to the famous Hunter Rifle in the Easter Egg Event in April.

How to obtain
Unknown at this current time

Trivia

 * The name of the grenade launcher "Thumper" may try to point out to the real life break action grenade launcher where else this thumper has a pumping slide mechanism which can only be found on the China Lake grenade launcher.