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Great post! Additional reading: To Challenge A Newly Won Throne: The Rise And Fall of The Light Rifle, Part II -The Firearm Blog

Doesn't look like an M1903 barrel star gauge, either.

B3222 photo #12 shows the bayonet rivet. These were never serial numbered by the factory or the Marine Corps.

Yeah, I ordered a repro M1941 butt stock from Murray's. He sent a beautiful piece of wood that had the correct exterior dimensions. It was not inletted and was therefore useless as I lack the skills necessary to complete the job. Murray explained that he didn't have an original stock to use as a template. A full refund was eventually made, but I never did figure out the object of that exercise. I was out shipping in both directions.

Welcome! The magazine cover spring should be a leaf of spring steel rather than the coil spring shown in your photo, It's part number 31 in the schematic and list shown here: Johnson Semi-Auto 1941 Schematic | Numrich (gunpartscorp.com)

RARE ORIGINAL WW2 M1941 JOHNSON SEMI AUTOMATIC RIFLE MAGAZINE AXIS PIN WWII | eBay I have bought from this seller before and have found them to be honest and diligent. Looks like the flared end of this pin might be slightly bent but that might be a trick of the camera angle.

Looks like a stock lamination is about to separate, too.

Couldn't find it. A link would be helpful.

I'd think that the recontoured receiver would pretty much preclude a restoration to the original configuration.

This rifle shows none of the typical Marine front and rear sight mods. It doesn't look like a gun that saw hard service in the South Pacific.

"New old stock condition" my foot. Thanks!

I don't think this is about the accuracy of the details. Rather, it's about one man's journey to a greater understanding of a classic design. His gunsmithing experience of many years aids him in this. I learned a few things, too. For instance, after owning and shooting a JSAR for the last 30 years or so, I didn't realize that the safety locks both the trigger and the bolt.

Very entertaining and informative video linked below. https://www.youtube.com/embed/9uXrWAR6GgE

Old thread, I know. Here's a pic of these stock markings found on the internet.

If your rifle is doing this look first to the recoil spring. The action should cycle gently, almost as an afterthought, dropping brass just a few feet to the shooters right. It should not be flinging dented brass to the far right of the firing line. Worn guns will cycle violently, too, causing excessive felt recoil and further battering the internals.