There are two kinds of first person view – traditional and true. “Traditional” First Person The players in-game view is set at fixed heights and rotates around a central axis. While the the player characters arms and weapon are visible, these are representations only and do not match their actual location. In most modern games,…

Read more True First Person Viewpoint

I did not make these up and they do vary a bit depending on the source, but overall they match those shown on this page.

Read more Rules of a gunfight