Cheers guys, 14" is sounding ok. If anyone can confirm the exact length is as Geezer has said, that's what I will make it to.

I also understand that the carbines/stutzens have a counter bored barrel the same as the later Airsporters, which I have always thought were to help make it easier to fit the front open sight by drilling/tapping through without going into the rifling. I prefer the look of the Mk1/2 Airsporters though where they are just turned, they would be easier to crown as well.



Any other advice welcomed. especially on the latest ideas for smoothing out the A/S internals. Titan spring? Alloy piston/O ring? or has anyone perfected a parachute type lip seal yet?