Sent you an email John.
Is cylinder and barrel from a later model compatible with a Mark I frame?
No, Different dimensions. The cylinder space is too narrow on a standard mk I to fit later models, especially those with the improved cylinder retention screw of the mk III onwards. UNLESS you get the mk I** frame. It will handle the later model upper frame and cylinder because it was factory remade to do so in WW1. But those guns are $3500.




















































