Hi, I would like to join GSSF and Shoot some of the matches. I bought a G17 Gen 3 to do so with. My question is what can I do to this gun and still remain stock? I would like to add some fiber optic front sights, a trigger job and maybe an extended slide stop. Aro-Tek is at my local gunshow and says htey can do a 3.5Lb trigger job using Glock parts, would this kick me out of stock class? I looked at the latest GSSF PDF download on the website but still find it a bit ambiguous. Please advise.