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Originally Posted by CORNfedREBEL
i have that same upper receiver marking on my new x, is that the correct marking from sw, my serial number begins with 19. i just got at a gunshow does this mean mine is a no name upper to? how can u differentiate between upper recevers. its a weird half circle thing mark just like in the pics at the start of the thread between the thumb assist and upper rail.
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No real way to identify uppers that I could find. That mark is the Cerro forge mark. Doesn'tidetify who macined it or what barrel or anything else.