Ron, I think your argument is persuasive as to 9mm function.
I think your opinion based on personal evaluation is point that cannot be dismissed, I would not doubt your educated opinion. Although I would also side with Albert and Tom as to the likelihood of an original 9mm carbine turning up on todays market. (But I bet the next one shows up claiming to be the one you saw back then)
Alvin, take one of your Lugers apart and contemplate the rear axel pin. When you figure out how that allows the linnear momentum of the toggle and the barrel-reciever to seperate, let me know :-) The momentum of the barrel and reciever are the force that operates the toggle. The spring link in the toggle provides the connection to the recoil spring that bleed off the momentum of the barrel-reciever and toggle assembly to prevent the action from beating itself apart.
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