1. Ammo is cheap, buddies aren't. If I see a target and I have a decent amount of ammo I will shoot repeatedly even if I have a 'sure shot'. Better safe than sorry. Of course, in airsoft I won't be shooting people in the mouth as I run by them :D
2. Cut the pie! You stand a MUCH better chance of not getting hosed if you stand a distance back from the wall and make a circular arc. This reveals terrain slowly and presents a minimal target. By getting right on a corver and peeking around you have to search ALL terrain immediately or risk getting shot while presenting a much larger target. Try it with a friend to test it if you don't believe me. It is the difference between going home and getting a flag handed to your mom.
3. Semi is for close (I.e. near point blank) shots. I only use it when we play CQB and I have to get a 'close kill' that won't surrender. It's not less accurate but again, ammo downrange is like insurance, you can never have enough. And as for trigger pull with triggers so light on airsoft guns if you're jerking the trigger you have no excuse. A good exercise we use in the service is to lay in the prone and sight your weapon. Have a buddy place a dime or washer on top of your barrel, and you pull the trigger. If the dime falls off you are jerking the trigger. Practice, practice, practice. You would be sprprised how much a slight difference in trajectory at themuzzle translates to missed targets downrange. I forget the exact formula but in Basic they said that if you move a rifle muzzle 1/4 inch at the line, your impact point moves five feet downrange. Do the trig if you have a hardon for it but the point stands, aim small hit small.
4. Teamwork will beat the best lone wolf players every time. USMC studies have proven that two men working in tandem have the combat effectiveness of five individuals. By working together, communicating and safely engaging targets in your lanes you will see a marked increase in kills and a lessening of friendly casualties.
5. Be behind cover. If you're not, you **** well better be heading towards it. And someone better be covering your