I'm still a bit confused, eightbore. The gun in question is a Grade 1 12 gauge Lightning with a serial # indicating 1967. That would have been in the years of maximum production of the Superposed and not a custom order.
My gun certainly seems to have a mechanical trigger. Were the mechanical triggers set up in Belgium or were they converted by Browning in the US for use with the Supertubes?
I've read that the two trigger systems are totally different and that the conversion from inertia to "mechanical" does not duplicate a true mechanical setup. I guess I'll have to grit my teeth and pull the stock off the gun and another with an inertia trigger to compare the two systems.
