Originally Posted By: Researcher
From the introduction of the Remington Autoloading Shotgun in 1905 until 1949 with the introduction of the Model 11-48 and "Sportsman" 48, Remington ribs on their pumps and autoloaders were milled integral with the barrel.
Good to know. Therein lies another difference between the M17 and M37R. The Upper Sandusky M37 vent rib barrels have a removable rib with sits atop machined stanchions integral with the barrel.
Jon, good to hear that you still have the M12 28 gauge. As you may know the rarity of that gun has spawned counterfeit versions.

Gil