3. Only hits count. The only thing worse than a miss is a slow miss.
The first part is the most important part of this rule. You can have a super-duper gun with all sorts of bells and whistles on it (we call it "cop candy"), you can have bevelled magazine wells, laser sights, tactical illumination, and blah blah blah, hanging from your gun, but it means absolutely nothing.
The only thing that counts in a gunfight is hitting your intended target with enough bullets, fast enough to make him stop shooting at you or anyone else... before you get killed!
As to the second part of this rule, if you miss, miss fast and get back on target and deliver some trauma! you don't have a lot of time to screw around here, mate!
4. If your shooting stance is good, you're probably not moving fast enough nor using cover correctly.
In Gunworld, instructors often ride students about their shooting stance. This is fine because new shooters need all of the advantages that they can get in order to master their new art. The catch here, is that when transitioning from being a new shooter to becoming a gunfighter (never confuse a shooter with a gunfighter, they aren't the same thing) you have to understand that in a gunfight, you MUST move throughout the whole encounter, or you will likely be a corpse at the end of it.
SHOOT! MOVE! COMMUNICATE! SEEK COVER!