This is what I've come up with, trying not to rip off the the USMC rules too much.
Shadow Run Rules For Gun Fighting
1.Bring a gun. Preferably a bigger or better gun than the corpsec and KE guys who are likely to be shooting at you.
2. If you can, bring a troll with a really big gun. tell him that if you live, you'll make sure he's got all the ammo he could want to shoot. It'll give him an extra reason to keep you alive.
3. Geek the mage first, or don't expect to survive the opening engagement. Frag the drones next.
4. If you shoot first make sure you hit. if you don't hit take cover, displace, and get ready to use grenades.
5. Move away from your attacker. Distance is your friend. (Lateral and diagonal movement are preferred.)
6. If you can choose where to have a gunfight, make sure you've got a sniper in over watch.
7. In ten years nobody will remember the details of caliber, stance, or tactics. because your team isn't talking about it and you didn't leave any witnesses.
8. If you are not shooting, you should be communicating (Hacking, directing drones, talking to your over watch), reloading, and running.
9. use caseless ammo, less physical evidence at the crime scene, the better chance they can't track your gun's ballistics as easily.
10. Someday someone may kill you with your own gun, but they should have to beat you to death with it because it is empty, and the advanced safety feature has impaled the grip on to their hand.
11. In combat, there are no rules, always cheat; always win. The only unfair fight is the one you lose.
12. Have a plan.
13. Have a back-up plan, because Mr Johnson didn't like the original plan.
14. Have another back-up plan, because everything has gone to shit.
15. If none of those work, wing it because you are FRAGGED.
16. Use cover or concealment as much as possible. The only visible target should be in your gun sights.
17. Flank your adversary when possible. Protect your flank.
18. Don't drop your guard. Use what you have to your best advantage. Don't get stuck in a mindset that limits you.
19. Always tactical load, turn your commlink to hidden, run ECM, double check your smartlink, and keep your UWB radar on threat scan 360 degrees.
20. Don't shoot he wage slaves, nothing makes it personal like killing corp drones.
21. The best gun fight is the one that never happened, the second best is the one done quietly, the third is the one that is over quickly.
22. Know what weapon to use and when to use it. A knife,club or your hands when used properly will kill just as quickly as any bullet.
23. Know how to fight anywhere. Not knowing will just get you killed.
24. Be courteous to everyone, friendly to no one.
25. Be polite. Be professional. till your cover is blown, but have a plan to kill or disable everyone you meet.
26. The biggest guns don't matter, only the most effective ones make a difference.
27. Defend yourself at ALL times and ALWAYS protect your buddy.