Kind of a bummer because this gun is in great shape other than that and a few small blemishes. I’m buying the gun from him regardless, can’t pass it up.but the only bad thing is whoever owned it before him sawed the barrel down and did a crappy job. I’m confused?! Any thoughts from those of you with more experience? I forgot to take a picture of the barrel.next time I’m over at my buddies, I’ll have to do that. According to the charts I’ve found on here, that puts it at an October 1942 build date (MM being ‘42)? I thought that was pretty awesome and a rare find, so I reached out to Remington to confirm it and they are saying that my serial number puts it as a 1950 model.but then the guy said only the first two letters on the barrel determine the actual manufacture date, but this barrel clearly has an E, than a space, and then MM together.which according to the chart is 1942? So I have three letters.not two? Also, there is no letter prefix before the serial number. The Mossberg Remington 870 Barrel features a matte blued finish. Though it’s possible that this one won’t work with 870 12 Gauge 3.5 Magnum models, this barrel is still a great inexpensive alternative to Remington. New to the forum and to shotguns, so I have been learning a lot lately! Have a friend selling a Wingmaster and we started doing some research on when it was manufactured.īarrel stamp is E MM and it has the receiver serial number (which matches) stamped on the barrel as well, which tells me it’s definitely an older gun. Mossberg created a high-quality barrel that fits your Remington 870 pump-action shotgun better.