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It is named after the Borz (wolf) because of its position as Chechnyas national animal.

For small, low-pressure cartridges, like the common.22 caliber rimfire cartridges, even very thin-walled tubing works as a barrel, strapped to a block of wood for a handle.

A rubber band powers the firing pin, which the shooter pulls back and releases to fire.

The better designs use heavier pipes and spring loaded trigger mechanisms.

Larger zip guns, such as homemade shotguns called tumbera (Argentina), bakakuk 7 (Malaysia), or sumpak 8 (Philippines) are also made of improvised materials like nails, steel pipes, wooden pieces, bits of string, etc.

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They require registration under the National Firearms Act and a tax in the amount of 200 to manufacture or 5 to transfer is levied.

Made of two pieces of pipe that fit snugly together, the paliuntod were simple, single shot guns.

These pipe guns are still in use by both criminals and rebels in the Philippines.

Rich Richardson, who fought with the Filipino insurgents during the Japanese occupation.

Made by Richardson Industries as the Model R5 Philippine Guerrilla Gun, these 12 gauge shotguns sold for 7 U.S.

Dollars at the time.

To use, one simply inserts a shotgun shell into the smaller diameter pipe.

Place the smaller pipe into the larger diameter pipe and forcefully slide it back until the shells primer makes contact with a fixed firing pin located inside the end-cap, firing the gun.

To reload, simply place another shell into the now muzzle end of the pipe.

When the pipe gun fires, it will blow the expended shell out of the muzzle along with the shot.

Pipe guns are easy to make, easy to use and can easily fire 12 to 15 shots per minute.

A cap gun can be disassembled, and a barrel added, turning the toy gun into a real one.

A firing pin can then be added to the hammer, to concentrate the force onto the primer of the cartridge.

If the cap gun has a strong enough hammer spring, the existing trigger mechanism can be used as-is; otherwise, rubber bands may be added to increase the power of the hammer.

Blank -firing guns can also be converted by adding a barrel, although the low-quality alloys used for cheaper blank-firing guns may break with the pressures and stresses of a real bullet being fired.

The simplest multi-shot zip guns are derringer -like, and consist of a number of single-shot zip guns attached together.

The Pepper-box design is also used in home made guns because it is relatively easy to make out of a bundle of pipes or a steel cylinder.

In late 2000, British police encountered a four-shot.22 LR zip gun disguised as a mobile phone, where different keys on the keypad fire different barrels.

Because of this discovery, mobile phones are now X-rayed by airport screeners worldwide.

Authorities believe they were manufactured in Croatia, and they still turned up in Europe as late as 2004, according to a report by Time magazine.

Together with a Polish version of the Sten sub-machine gun, with which it shares some design elements, it was the only weapon mass-produced covertly in occupied Europe during World War II.

It was designed in 1943 by Henryk Strpo and was produced in underground facilities in the area of Ostrowiec witokrzyski.

Its name was coined after the Bataliony Chopskie organization members who were informally called bechowiec (plural: bechowcy ).