About a month ago we talked about the PICRA family of cartridges. As I mentioned in that article, this Czech company makes not only ammunition but also competition pistols and revolvers, hunting rifles and unusual weapons like net guns and blank firing guns that the manufacturer calls acoustical weapons. In this article, we’ll take a quick look at the Picra’s acoustical gun.

The model designation of Picra’s acoustical weapon is HUMBUK-05. It is a blank firing firearm specifically designed for use in recreations of battles, airshows and theatrical performances. To make a louder gunfire simulation, this weapon has a built-in mechanism that amplifies the sound of the fired blank cartridge. The gun itself feeds from a cylinder – like a giant revolver. It is possible to equip it with 30 or 60 round magazines/cylinders.

Note the electric motor attached to the rear portion of the receiver. It allows to remotely control this firearm.

The HUMBUK-05 acoustical gun is chambered in a blank cartridge called .357 KRAKEN, which is dimensionally similar to the .357 Magnum case and looks like a blank cartridge made of .357 Magnum case.

Note the caliber marking on the receiver

Drawing of the .357 KRAKEN cartridge – excerpt from CIP cartridge specs. You can download the complete drawing by clicking here.

Because the trigger can be electrically controlled, it can simulate a fully automatic rate of fire. Perhaps the operator can even choose any rate of fire within its mechanical limits.

Picra HUMBUK-05 acoustical weapon mounted on an aircraft.

Here are also the dimensions of this firearm specified by the manufacturer:

Interestingly, the Picra states that in order to purchase it, one does not even need a firearms license in the Czech Republic.