Developed in the mid 1500s, this was a combination weapon that blended a Matchlock with a traditional Mace. The weapon was half the size of the Arquebus gun (at 2.5 feet). Affixed over the barrel of the gun was a flanged Mace head (hollow to allow for placement of the barrel). This allowed the weapon to be used in closed quarter combat. The weapon had a grip extension which allowed it to be properly gripped (when swinging it as a Mace).
The gun fired the equivalent of a .50 caliber round. Considered a "novelty weapon", it is unclear how many of these were made or even used with any success. VERY few examples have survived into the Modern Age.