Update: M-10 Riot Mystery

[Jimc00]

I see that the second barrel in the photos is serial # 160442, the number sounded familiar. I have #160443. The barrel is marked 10-R and is stamped CYL and has an ordinance stamp. Number 121700 has no model or ordinance marking. It also has a 20" bbl and is stamped CYL.

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[Dave L]

What are the odds of finding consecutive numbers ..slim.
From my personal observation on these guns remington cut the long modified 26'' barrels down to make the trench guns.