I use CT on my G20SF and G30
What are the first 3 letters of the serial number?
EFX; looks like I have Gen 3
if you must get a laser i would say go with the laser max guide rod. its sighted in at the factory drop it in and dont have to worry about sighting it in.
jon
I have this for my glock. its an awesome laser light combo
http://www.amazon.com/Streamlight-6...?ie=UTF8&qid=1370791997&sr=8-2&keywords=tlr+3