Here is what I do. Have the dealer send the gun directly to John in PA. Then, he does his thing and sends it to me. I don't even want to see it before it has been through his hands. Just did that with my TX200 MK III and he has also done four others for me (several of which had already been to a tuner i don't even want to think about - so be careful who you go to). John makes you part of the tuning process which I really like, because it also becomes a learning process for me. Prices vary. Give him a call at (717) 873-5128. He is popular as noted here: http://www.airgunsofarizona.com/hunting/2017/02/hw-97-out-for-jackrabbits/Good luck in your search.