This is a very fine example of a scarce Remington/UMC Model 10-R, factory built as a riot shotgun. A small amount of these Model 10-R riot shotguns were sold to the U.S. Military for use in World War I, with this example void of any U.S. markings and likely sold commercially. The Remington Model 10 shotgun was originally designed by the well respected engineer John Pedersen. Serial number "U/160733" marked on the front underside of the receiver. The barrel is correctly roll marked with the Remington circled "REP" factory proof along with "160773" (very likely a factory error with the fifth digit incorrectly a "7") marked upside down on the lower right rear side of the breech. The top of the barrel is correctly marked "MODEL 10-R" ahead of the three-line Remington-UMC address and patent markings. Fitted with a ribbed walnut pump handle, smooth pistol grip buttstock, and checkered plastic buttplate.