Some 11-87 shotguns, especially those with barrels shorter than 26", or Magnum models, may have issues cycling light target and birdshot loads consistently.
The 12 gauge 3-1/2" Super Mag and 20 gauge Magnum models come with an extra component on the magazine tube called a "barrel seal activator" that helps cycle lighter loads.
It is well used, and two small pieces of the bolt has chipped off. Hunting license from North Dakota hidden beneath recoil pad indicating a pre 1924 model.. I have Remington model 1900 that is probably less then 10 years older then my Model 11 that it makes a good match to.
I got this gun for free, and after stripping it down, i can see why. Being a Remington fan I bought it more our of curiousity and as a "Wall Hanger" but it sure is fun to be able to shoot it a bit as well.
My understanding is that when sent back to the factory for repairs, they stamped another letter on it to indicate that is had been repaired.If you are looking for a complete reference on this subject I recommend the "Complete Guide to United States Combat Shotguns - Published in 2007" by Bruce Canfield. I shot 10 rounds with it first thing, so it does still work. The old plant ledger available on the Remington Society of America web site begins with serial number 199611 on 30 September 1919, so your gun is likely from the mid-teens. Browning designed shotgun was introduced in 1905 as the Remington Autoloading Gun when the company name was Remington Arms Co. In 1920 the company name was changed again to Remington Arms Co., Inc. I bought one almost identical to it last summer for 0 US. I got my gun for free from guy who needed a license for a new Franchi predator.Serial numbers match on receiver, tang, trigger assembly, and stock (As far as I know all barrels should be marked with a US and Ordnance bomb as well as serial number, this examples is not marked with either - Click here for example).The early models like this one have checkered wood, a engraved game scene on the receiver, and a Military Inspectors Cartouche on the stock.