WWII Stevens Marked M.520 U.S RIA

[BobcatAngler]

First post here and am hoping for some help with a new purchase. I just purchased this riot gun from a local gun shop. The shop explained it was most likely an early civilian model that was 'militarized' early in WWII to meet demand. I'm hoping someone with more experience can give me some additional information. I have always wanted a riot/trench gun so I spent $1000 on this. It seemed like a fair price but after doing some more research I'm worried this may not be legit. Thanks!

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