Hello Sir, and 1000 thanks for this video! I am new into this, and I could learn a lot, now!! It's been quite a while ago that I had the idea of buying the 6'' version of this replica, in 4,5mms as it is easier to get in this country rather the 6mms airsoft one. However, I watched another video here on youtube, and the author shows that the 6'' version does not have a full lenght rifled barrel, but on the contrary, it comes with a shorter rifled one completed with a tube to meet the rest of the lenght. So the maker uses the same barrel for all the 3 versions, on the rifled construction. If this is always the case, is there any aftermarket 6'' barrel I could possibly install ?? To end this long boring text I'd love to ask you where did you get this springs kit, and did this very model came with this cylinder? If not where did you get this from??? Thank you so much!