I have some extra 177cal HW barrels so I decided to cut some back and shroud them. Since I was having them reblued as well I added removable tool steel cocking lever pins and breech inserts. The top of the breech was plugged and milled flat. I've got a R9 that will most likely get this one. I might even get around to the last Varmint stock for it. I also have a R7 barrel that's getting the same treatment. I'll match blue the whole gun though. Should make for a true one off. I've yet to see a R7 with no breech holes. I might contour it like the UberLuft127. You have a little more meat in the breech considering the R7 has a smaller OD barrel and lot softer spring.