Hi Bill, that is an excellent suggestion... although I know the mass of a bull barrel of max dia. and a certain length is too much for the luger action... it will affect recoil.. John V. Martz did a lot testing on this to see what they could and couldn't get away with.. that is why my custom .30 Target Luger made by JVM has slab sides on it so it would function with factory loads.. I think it was marginal to start with, but with the slab sides it works perfectly! Maybe that is a consideration.. we'll see... lot'sa beach to cross before we get past the baby turtle stage! All ideas are welcome and considered... best to all, til...lat'r...GT