If it uses a battery, green gas, or co2 its a full auto and can shoot multiple times.
There are two companies that make Full-Auto Pellet machine guns, Air Ordnance and GMG (Gas Machine Gun). (see the links below)
Very generally speaking, class 3 refers to full auto machine guns, short barrelled rifles or shotguns, and silencers.
Depends on you're using the definition of machine gun as an often crew served weapons designed to deliver suppressive fire, or the BATFE definition, in which all full auto weapons are designated as machine guns. The Czechs in the runup the Second World War had a 9mm submachinegun with a bipod for use in the suppressive fire role. That would probably have been the smallest under the first definition. By the BATFE legal definition (where any full auto is considered a machine gun), the smallest semi auto handguns, if they underwent a conversion, could take this distinction.
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No one sells a full auto BB gun, The guns are usually 6 shot burst. One company sells a Full-auto .22 cal Pellet gun on the web.
Machine guns are useful for killing people. They are also useful for aiming bigger weapons; since machine guns fire tracer ammo, a machine gunner can fire on a target so the forward observer can train guns onto it.
No. No additional machine guns may be transferred to a private citizen that were not already registered with the BATFE by May 1986. Full auto weapons made after that date may only be transferred to a law enforcement agency, a military agency, or another machine gun dealer.
Seeing that your question is in the "nuclear weapons" section, I would assume you are only asking about nuclear weapons of WWII. If so, please check out the links in the "related links" section. If not, I cannot answer your question thouroughly, but there were: Rifles (Bolt-action and semi-automatic) Submachine Guns (Full-auto guns which fire pistol rounds) Pistols Light Machine Guns (Full-auto guns which fire rifle rounds) 1 Assault Rifle (Full-auto rifles) Grenades Vehicular weapons (Assault and Transport) AA guns Airplanes (Fighters and Bombers) Ships (Assault, Patrol, and Transport And many others
Auto ordnance used to but i do not know if they still do.
Fully automatic shotgun, no. Automatic rifles and machine guns, yes.
No. Machine guns will beat Gatling guns.