It is not an airsoft gun. It is a converted pistol using a product named "Safeshot" if I remember correctly. Basically, it's a blank firing system.
There are very few instructors I recommend without having to attach a bunch of disclaimers. Kelly McCann (aka Jim Grover) and Gabe Suarez are two on a very short list. I have never seen anything from either of them that wasn't geared toward making their students better fighters.
I don't think Kelly is doing public instruction any longer, unfortunately.