This is just a little script for easy burst firing. There are 2 different burst fires: 2 shot and 3 shot. The different shots are bound to the F1 key. Press F1 repeatedly to switch between the different bursts. 

This script has been thoroughly tested and has been optimized for all guns.

Place the code below into your autoexec.cfg

// Inferno's Burst Shot script

alias "w5" "wait; wait; wait; wait; wait"
alias "w10" "w5; w5"
alias "burst" "b1"
alias "burst1" "+attack; w10; w5; -attack"
alias "burst2" "+attack; w10; w10; w5; -attack"
alias "b1" "bind mouse1 burst1; alias burst b2"
alias "b2" "bind mouse1 burst2; alias burst b0"
alias "b0" "bind mouse1 +attack; alias burst b1"
bind F1 burst