Improvised firearms (sometimes called zip guns, pipe guns, or slam guns) are firearms manufactured by an entity other than a registered firearms manufacturer or a gunsmith. Improvised firearms are typically constructed by adapting existing materials to the purpose.

A bamboo gun is a traditional toy gun, a pop gun made from a hollow cylindrical piece of bamboo and a piston that works as a syringe plunger. A tough small "bullet" like a dry seed or a wet piece of paper is inserted in one end of the cylinder and the piston is pushed in rapidly at the other end.

Sumpak may refer to: an improvised firearm used in the Philippines; a traditional bamboo toy gun used in the Philippines; a fire piston, a device used to kindle a fire

Guns of this type usually consist of two or more tubes of piping welded together to create a device that resembles a firearm. A Sumpak is a known example of pipe gun, particularly in the Philippines. Historically, improvised guns have often taken the form of very basic open-bolt submachine guns.

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A homemade shotgun or tumbera (Argentina), bakakuk (Malaysia), or sumpak (Philippines) is a firearm made of improvised materials like nails, steel pipes, wooden pieces, bits of string, etc. It can be made by "low budget" criminals and is sometimes found in jails.

2011年1月21日 · Tagalog boys call it sumpak. It consists of about a foot of bamboo branch open on both ends for “barrel” and a “trigger” made of 3 o 5 inches of same diameter but equipped with a sturdy and polished stick enough in length and thickness to go through the hole of the barrel.