I have an M70 with two barrels... .308 factory and 22-250 AI Hart. I enjoy this set up and it does save a bit on hardware although I use two scopes, one for each barrel. Mainly, I like the concept and have experienced excellent repeatability and accuracy switching barrels and scopes. I used to do the same with an M700 that I had two bolts, six barrels, two scopes and 2-3 stocks for, but I had an inside action wrench and portable barrel vice for. For the current M70 I am using neither, just two-hand tightening. I haven't had either come loose and I do check frequently. Any problem with with this? I seem to recall reading that BR shooters did the same thing.