My new QB78 Deluxe, allready fitted a new breech seal and trigger spring. Charlie da Tuna offers a clear tuning guide on his website so tweaking it is on my to-do list. You can also look at the Youtube vids made by Archer airguns and Rick Eutsler (airgunweb). Hope to fit the iron sights of the standard QB78 soon so it looks more like a Crosman 167. Have had this one abt 24 hours now and must say I am extremely happy with it. ... qb78 industry brand shanghai airgun factory norconia deluxe tweak ...