Update: M-10 Riot Mystery

"Hi everyone,
Here's my latest question. I picked another model 10 "riot" via the net which turned out to be what I believe is simply a hunting model cut down. The barrel is marked Model 10-A and is stamped CYL. However, on the bottom of the barrel, concealed by the magazine tube, it is marked "MOD". Upon closer inspection of the CYL. stamp it is clear that it has been stamped over a faint "MOD" stamp. The "CYL." stamp looks identical to the Remington factory stamp, in size and font, that is on my other Model 10 (with a proper factory riot barrel) which leads me to believe it was done at the factory. Can anyone explain this to me? Would there be a reason Remington would have modified a hunting shotgun into a riot configuration or is this the work of another gunsmith? The M-10 in question was produced in 1918 so I am told. There are no military markings on it and there is nothing out of the ordinary about it other than the over stamp I already mentioned. Any help or info would be appreciated."

UPDATE: I just returned from the collectors show in Louisville this weekend and talked with some of the dealers about it. Two thought the barrel was cut, modified and re-stamped at the factory for the military but never made it to an armory because the war ended in 1918, the same year it was produced. Therefor no military stamps ever made it onto the gun and it went from the warehouse to surplus. The finnish is much more intact on the barrel around the sight bead than on the rest of the gun, which leads me to believe that the barrel was cut down quite some time ago. Does this theory make sense or is this over zealous guesstimation on their part? Just curious. I've had a few of these and this is the first one I've had that functions flawlessly. Regardless of the history it's nice to have one that's a reliable shooter!

What's the serial number of your gun? Is it in the WW1 known serial number range? And how long is the barrel?

FWIK, Model 10 long barrels and trench gun barrels are marked 10-A. The trench barrels are about 23 inches long. The riot barrels are marked 10-R and are about 20 inches long. Both the trench and riot barrels are "CYL" bore marked. I don't think I've ever heard of one with the "MOD" marked overstamped.

The barrel is 20 inches long and is marked Model-10A. The serial number is 150927. I agree that the gun is weird and I have never heard of the over stamp either. I agree with the philosophy of don't try to make a gun something it's not and it is what it is. But the question is, what IS that exactly? I'll try to take some photos soon and post them. not sure if the over stamp will show up that great but I will do what I can.

Maybe these pics should shed some light on the subject.Both are model 10A trench gun barrels cut from modified barrels.There are no cyl stamps on the side of both these barrels.Serials numbers 160417&159698.
I know a gentleman from Nebraska who had an over stamped cyl trench gun hope this helps.

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.

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.