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Jim; You should have seen the "Fish that John West REJECTED!"

https://www.milsurps.com/showthread.php?t=47353&p=287400&viewfull=1

Has some more answers.

And takes note of the Stevens 77E series.

I waded through a large number of ex-US shotguns; Win....

Doesn't the adapter for the 1200 also take the Garand bayonet as opposed to the old M-17 type?