870 Wingmaster "military" model with bayonet lug?

[chromedome]

Hello from my first post here.

I just purchased a used Model 870 Wingmaster that was described as a Military Model. It has wood stocks, and matte gray (possibly old parkerizing) finish and, most interestingly, a heavy duty barrel/magazine clamp fixture sporting a sling loop and bayonet lug. The magazine tube is stepped down to accept the bayo loop.

The serial number is S264061V.

I would really like to know more about this unusual (to me, at least) shotgun. Is it particularly unusual or valuable? What is the year of production or least the years these were issued and/or made, and is it in fact a military firearm.

There are no visible ordnance marks such as a flaming bomb, etc. but there are several proofing stamp type letters on either side of the barrel right next to the receiver, similar to what I'm used to seeing on an old Garand, etc.

Thanks for any help you all can give.

[The Rifleman]

They were quite popular in the Vietnam War.

1969 Remington introduced Model 870 field models in 28 gauge and .410, which were issued with scaled-down receivers, and lightweight mahogany stocks and fore-ends. Remington also introduced Model 870 "Matched Pair" 20 gauge and .410 Skeet guns with walnut stocks and hard carrying cases, selling for $395ºº the pair. Over the next three years 1,503 pairs would be sold. Remington also introduced a 20 gauge Model 870 Brushmaster Deer Gun in Standard or Deluxe versions. Remington contracted with the U.S. Marine Corps to fabricate 3,231 Model 870 Mk-1 military-style, 12 gauge Model 870 shotgun with 7-shot magazine extensions and fitted with bayonet attachments.

http://www.remingtonsociety.com/rsa/journals/870