The same thing that happens whenever ANY firearm fires accidentally:
The bullet will leave the barrel at a high velocity, and anyone/anything in that bullet's path will be hit.
If there is anything flammable near the muzzle, it could catch on fire.
A hadgun that fires a .5" projectile
Probably. It would likely refer to a handgun that fires a .45 caliber ACP, or .45 GAP or an older .45 caliber revolver round.
Possible.
Generally it is a small concealable auto loading pistol of limited power. It takes its name from the .25 ACP cartridge that it fires. It is called .25 caliber (notice the decimal point?) since the bullet it fires is about 25/100ths of an inch in diameter.
The short answer is no. The longer answer is, you may be able to get a .25 cartridge into a .22 caliber gun, but it will likely jam and be very difficult to get out, and if it fires, it will probably damage the gun and possible the shooter. The .25 has a larger diameter than the .22.
Undoubtedly, currently the most popular handgun in America is the Glock 17 which fires the 9MM Luger cartridge. Rapidly catching up however are the 40 caliber handguns offered by Glock. In close second would be 9MM and 40 caliber models from: - Sig Sauer - H & K - Beretta - Taurus - Ruger
There is no handgun that fires 12 guage shells besides a sawed off shotgun, which you need a title 2 weapons permit to puchase.
Assuming you mean caliber, the caliber simply refers to the diameter of the bullet the gun is designed to fire. American cartridge sizes are expressed as tenths or hundredths of an inch, and European cartridges sizes are expressed as millimeter. A .40 caliber gun fires a bullet that is .40 of an inch in diameter. A 9 millimeter gun fires a bullet that is 9 millimeters in diamter. There are too many variations to list here, but some common handgun calibers are 9 millimeter, 10 millimeter, .40 SW, .38 special, .44 magnum, .45 ACP, .380 ACP.
It is a self loading handgun that fires a bullet nominally 0.45 inches in diameter. Which there are numerous DIFFERENT .45 caliber pistols, the best known may be the 1911A1. Initially adopted by the US military in 1911, it served as the main US military handgun until recent years.
It fires 5.7x28mm.
No. The AK-47 fires the 7.62x39mm round, which is of the .30 caliber, smaller than the .45 caliber.
Noop. an M16 fires a 5.56mm (or .223 caliber) bullet. A .45 caliber shoots a bullet that is ~11.43mm.