I'm not adding anything to the article, just pointing it out for anyone who's interested.

Anyway, it's pretty clear that they must have used a picture of a Japanese-issue SIG M1920 for the model reference, since the in-game model uses the SIG-pattern magazine housing, rounded bolt handle, tangent rear sight, and Japanese-made bayonet lug around the barrel. The cocking slot being on the wrong side is probably intentionally done to make it easier to animate the reloads (lots of older games did this).

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