As many as you have money to buy.
They don't. They are shot by PEOPLE that are using guns.
Four guns total. Two 9mm firearms and two 12-gauge shot guns.
6. Two were wounded but recovered.
There are many different types of guns! Shot guns, rifles, hand guns, pistols, even paint guns and air soft guns. Then with each type there are different callibers, which is the size of the bullet that is shot through it. the higher the number the bigger the calliber therefore the bigger the bullet and generally the bigger the gun.
The "better" question would be "how many murders, rapes, and robberies are prevented by home guns ?"
Check the FBI Uniform Crime Reports.
Most flare guns are single shot.
A tazer gun can be shot with 50000 volts of electricity.
There are many different types. There are pistols, rifles and shot guns. Pistols can be semi auto or single shot or a revolver. Rifles can be semi auto or full auto or bolt action or single shot or lever action. Shotguns can be semi auto or pump or single or double shot.
They made lefever shot guns starting around 1878 and ending in 1921.
Rifles, hand guns, shot guns, sub machine guns.
Your question is a oxymoron. Pneumatic BB guns are single shot. Machine guns are Multi shot. There are several C02 driven BB machine guns