yeah i know, this guy who lives in my state as me has his famas completely upgraded, has an eg1000, and its upgraded to 400 fps and it shoots REALY fast, its crazy cuz he uses a 12v battery, but yeah im planning on replacing the stock parts with better ones. PDI140? how much fps do you get out of that? but ifound thsi one place that sells a systema famas spring guide
cant beleive they still have it