Donderbus

The Donderbus may be an upcoming weapon in. Although it hasn't appeared in the game, nor has there been an official statement on it from Ninja Kiwi, its image and name can be found in a SWF file used by the game as of the August 26th, 2015 update. It's most likely built by Smoke Stack, due to the fact that it has the typical antique design characteristic to that manufacturer. It's also possible that this weapon is another Premium, as the SWF files do not show any images of a or Black version, in addition to having yellow stripes; most premium guns have yellow markings on them.

Trivia

 * Donderbus is the Dutch word that "blunderbuss" is derived from.