It's a model 336W (Walmart deal?), which is the same as a model 336C. Closest I could find, is that the MR means it's a Remington Marlin. There's no barrel stamp but Barrel has New Haven Ct. stamped on left barrel side with REP stamped on the right side of barrel. From what I found was when Remington bought/took over Marlin, they still used some of the Barrels Marlin had previously made in New Haven, but stamped them with the REP to indicate the rifle was produced by them. This makes it difficult to come up with the date since I don't have the original box which would contain the production date (I bought it used). Forum posts told similar posters they needed to contact Remington. I'm guessing it had to be produced early on after Remington took over Marlin in 2010, since they were still using Marlin produced barrels. The stock also looks and feels laminated to me.