Double Shot in Halo 2

This page will teach you how to double shot with a Battle Rifle in Halo 2.

Steps

A double shot is simply a button combo of pulling the right trigger twice, and the x button once, all within 1 second. (RRX) You need a battle rifle.
Another thing you can do is RRX YY RRX which kills your opponent much quicker than 4 normal shots. (make sure you have a secondary weapon)
This takes a lot of practice to master, so don't give up.
A good way to practice this would be to try to do a lot of Team Hardcore in matchmaking and just attempting to double shot every time you're not in a fight.
Also, when in multiplayer chose the Midship level if you are by yourself because the explosive gas tanks explode after six shots (or two rounds)with the battle rifle so if you do it right you will get a rewarding explosion.
And the stairwell on Midship was for me, perfect for practicing the crouch or natural(regular) jump double-shot (see below). This is a thing that will drive you insane, but once you master it, it is a very valuable tool in your arsenal.
Here's a hint if you change the config on your controller to boxer the double beatdown then rifle shot (BxBR)will be that much easier to use.But i warn you with that config some of the other tricks in this page are practically impossible to do.GOOD LUCK!

You must pull the triggers, not push them, as they are very sensitive and the time between the R-R-X must be quick, but EXACTLY the same.
If you don't fully press the R trigger twice along with the X button (This is a common mistake), you'll only fire once, and after firing, you will reload your clip. If you double shot RRX YY RRX It is easier to kill an enemy.

Battle Rifle
Secondary Weapon
Practice
Claw grip (is optional for aiming the double shot)
Southpaw sticks (aims melees and double/ quad-shots by using the left stick - again this is the alternative to the "Claw grip". You don't have to use either if you don't want to)