Need a simple script!

Hi there. Looking for a simple AHK script that will help with reload cancelling. I want it to do the following: press a key shortly after I left click. For example I want to reload instantly after I shoot each time.

Basic example.

I: Mouse1
Script: (very short delay) press "r"

That's it. Any help is appreciated.

I wrote this up for ya:

It starts in inactive mode. Press Pause to toggle on/off.
Press ctrl+esc to close script.
Change the sleep value to change the delay.