When you are flying a helicopter in Multiplayer mode and you start to get laser targeted (not GTAM), fly as fast as possible trying to stay as low to the ground as you can and if done correctly the missile will hit the ground and miss you almost all of the time.
The shotgun and sniper rifle glitch; the utmost necessity when using the sniper or engineer kit. How it works: When you're using the sniper rifle or the shotgun, shoot one round. IMMEDIATELY after, switch to another weapon or tool, then switch back. Purpose: You do not have to wait for the pump or bolt action for the next round. Note: Only works for the engineer and sniper.
Times when necessary - Sniper: When you know an enemy is right behind you or is in point blank range, you can use the glitch up to five times without having to load the chamber with another bullet until you have to refill the clip. Also, another useful way to use this glitch is when you miss your first target, use the glitch and take another shot.
Engineer: x3 more deadily when the glitch is used. If you have an enemy close range, or medium, the glitch is a god. No more waiting for the pump! Also useful when you have multiple enemies within a very close area. The glitch can be added in with the rocket for a 1, 2 punch.
Mejor que todos-Hit me up if you have any questions about the glitch.