A sawed-off shotgun (also called a scattergun, sawn-off shotgun, short-barreled shotgun, shorty or a boom stick) is a type of shotgun with a shorter gun barrel—typically under —and often a shortened or absent stock. Despite the colloquial term, barrels do not, strictly speaking, have to be shortened with a saw. Barrels can be manufactured at shorter lengths as an alternative to traditional, longer barrels. This makes them easier to transport and conceal due to their smaller profile and lighter weight. The design also makes the weapon easy to maneuver in cramped spaces, a feature sought by military close-quarters combat units and law enforcement SWAT team users. As a result of the shorter barrel length, any sawn-off shotgun with a magazine tube will have its capacity reduced. In the 1930s, the United States of America, United Kingdom and Canada mandated that a permit be required to own these firearms. They are subject to legal restrictions depending upon jurisdiction. They are used by military forces and police agencies worldwide. Compared to a standard shotgun, the sawn-off shotgun has a shorter effective range, due to a lower muzzle velocity; however, its reduced length makes it easier to maneuver and conceal. Powerful and compact, the weapon is especially suitable for use in small spaces, such as close-quarters combat in a military context. Military vehicle crews use short-barreled combat shotguns as ancillary weapons. In urban combat zones, military entry teams often use entry shotguns when breaching and entering doorways. Many jurisdictions have a minimum legal length for shotgun barrels to make these more concealable shotguns unavailable for criminal purposes. Many gun makers in the U.S.A. have not offered sawn-off shotguns to the public since 1934, when shotguns with barrel lengths of under 18 inches were restricted, although they had previously been sold. To abide by NFA regulations, anyone may complete a Form 1 "making" form, and purchase and have approved the US$200 tax stamp for the shotgun in question, in order to legally reduce its barrel length to less than 18 inches by cutting the barrel or replacing it with a shorter one.