QUOTE(chino @ Thu 20 Mar 2008 1659)

The thing that you put at the end of the barrel - small arms or canons - has many, many names like:
- muzzle
- muzzle booster
- muzzle brake
- flash suppressor
- flash hider
- compensator?
Are there any more?
I don't claim to be an expert -- nor am I quoting from a notable source. Just familiar enough with "gun culture" to offer to help, and hoping I can get most of this right.
You ask about the "thing that you put at the end of the barrel" ... many guns don't have any "thing" that you put at the end of the barrel. Only some guns do.
All guns have a muzzle. The place where the bullet (or projectile) comes out is called the muzzle. It is called this whether you put any "thing" on it, or not. The word "muzzle" is a reference to a mouth, I believe. The term can also be applied to an animal's mouth. The opening with teeth, perhaps.
You might consider it the end of the barrel. But that would be like saying the mouth is the end of the throat. Yes, it is, kind of. It comes at the end of the throat, but it is useful to be able to discuss the mouth itself, not just the end of the throat. So also there is a barrel, and at the end of the barrel there is a muzzle.
There are a number of "things" that you might place on the muzzle of the gun.
- muzzle brake: This device reduces the recoil that you feel, by diverting some of the gasses that come out of the muzzle when you fire the gun into other directions beside straight forward. That way they don't form such a strong jet pushing the gun backwards when it fires. For cannons most muzzle brakes divert gasses out to the sides. For small arms most muzzle brakes divert gasses upwards, because most small arms not only recoil backwards, but the muzzle jumps upwards too.
- flash suppressor / flash hider: This device reduces the visible flash from firing the gun. Some are actually able to reduce the flash when seen from the front, so that your enemy will not see you as easily when you are shooting at them. But most only reduce the flash when seen from the rear, so that you are not blinded by the flash when you fire your own weapon. This can be particularly important at night. Flash suppressors/hiders are often cup or funnel-shaped.
- compensator: This word is not clearly defined. There can be many kinds of compensators. Most often it means a device like a muzzle brake, but which is not designed to keep the gun from kicking backwards so much as it is designed to keep the muzzle from jumping upwards when the gun goes off. So a kind of specialist muzzle brake which vents gasses upwards.
- muzzle booster: Almost the opposite of a muzzle brake. A muzzle booster seeks to channel some of the gasses that would go away to the sides, and make it go straight forward, so that there is a
stronger recoil. This can help some guns to function properly ... particularly automatics (light machine guns, for example). Flash suppressors/hiders, because of their shape, often also function as muzzle boosters.
QUOTE
I have even seen muzzles that have sharp pointy bits - I presume, for stabbing people. Are they any good?
I have never heard of a case where a gun was designed for you to actually stab someone with the muzzle.
Often a blade can be attached to the front of a military gun for stabbing. This is called a bayonet. It is usually a knife, with a special mechanism for attaching it to the muzzle. Sometimes it is a spike, rather than a knife. But I've never heard of a gun where you might actually stab
with the muzzle of the gun.
Hope that helps.
-Mark 1