"The Thumper is a break-action grenade launcher that had fought until today with its iconic launching sound, hence the name.

Additional notes:
The Thumper's grenades have a similar projectile trajectory to the Rocket Launcher, it can be aimed high to maximize long-range destruction. It has a lesser blast radius than the Rocket launcher but it is in fact on par with the Bombardier, use these similarities for taking down foes around cover. Although the Thumper deals more damage than it.The reload duration is on par with the double barrel weapons in the game.

This gun is connected to other several firearms, check them out down here:
https://steamcommunity.com/sharedfiles/filedetails/?id=1358732933
https://steamcommunity.com/sharedfiles/filedetails/?id=1107555738
https://steamcommunity.com/sharedfiles/filedetails/?id=975565295
https://steamcommunity.com/sharedfiles/filedetails/?id=942508123
https://steamcommunity.com/sharedfiles/filedetails/?id=880653599
https://steamcommunity.com/sharedfiles/filedetails/?id=880653158

Important Note:
Sometimes the description of the weapon will mention another firearm which isn't in the vanilla game & is another gun from another artwork, to know more about the other, you may see it for yourself in the links above. Also notice that this is my 100th artwork, very nice. The title's color will depend on the gun's rarity while the flag will represent the maker's. It will be a weapon for a mod, no one will be able to take my concept unless if I accept your permission. You can check out this mod that will take the gun soon here: http://steamcommunity.com/sharedfiles/filedetails/?id=1282189856"