It can be done with custom work, as far as I know there's no aftermarket accesssories.
What you do is pop out the pins on the trigger frame, and you need to adjust the strength of the springs (I changed my 98customs springs into elastics used for braces, because they are much lighter) and if a SMALL amount of electric tape around the pin that the sear rests on it will lower the back end of the sear, allowing for a shorter pull to make it fire.
If you dont know what Im talking about you might not wanna try poppping random pins out of ur marker and taking it apart as you will most likely mess something up!