What joints do I need to put on my gun and projectile. Where and what name?

[SoulStealer]

Im trying to make a gun but Ive never made guns before. And I need to know what joints I need to put on the model and where I need to put them. Please tell me the name of the join and what place I should put it in.

Example
Jointname   -   put it where you want the gun to shoot from

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[TheKhoz]

Please try to find it instead of just asking.

http://forum.blockland.us/index.php?topic=108156.0

[BlockStar]

muzzlePoint  -  Put it where you want the bullet to come out

mountPoint   -  Put it where you want your person to hold it