Thanks for the write-up. One thing is a little confusing, "This is for the threaded-barrel Gerry makes......" Just to be clear, I do not make threaded barrels. I made this particular tool to fit the barrels you make, and am happy to supply a tool to those who buy your threaded barrels to ease the frustration of field stripping the R51. Again, thanks for the write-up; just wanted to be clear.