I honestly didn't believe half of what has been written about the GRTIII. How good coould a $30 drop in part be? But nothing could be worse than that factory trigger on my whisper. In less than ten minutes we went from garbage to gold. It seems that I have a new hobby now. Guns that I can shoot in my backyard that will do more than dent cans and actually hit something smallr than a wall. I'm sold! How difficult are these things to work on? And what is involved in a tune? Charlie, my man, that trigger is the greatest thing since sliced bread.