I saw one time on a post what all Ernest does on a tune . I do remember it is a LOT !! I know he laps barrel , rebuilds and cleans regulator, smooths up action, hand torgues all screws so there is no bind , lightens trigger , and way more that slips my mind at the moment. Best part for me was the shot count increase and accuracy !! My 25 gets 48(4 clips) on a charge from 200-110 bar . And honestly the DonnyDu shroud and LDC helped accuracy also