I notice one "Gen" has dimples popping outward and one has dimples going inward (above the mag well under the ejection port).
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I notice one "Gen" has dimples popping outward and one has dimples going inward (above the mag well under the ejection port).
You're looking at two different parts of the rifles. They're the same on both. The ones that look like they're popping out are towards the rear of the ejection port. The ones that look like they're going inward are weld marks under the ejection port.
Okay, got a chance to look closer at it today. It has the mag release that sits more forward, looks like the oval AR type. Serial number is 015XXX (don't recall if there's another digit or not but the first 3 are 015).
I looked closely at the exterior of the barrel and it doesn't have that "sheen" that nitrided parts do. Now I know nitriding/Meloniting can look a little different depending on who does it, but I've seen enough to recognize that shiny and slick-looking black color. This barrel has more of a dark gray, almost park color to it. In fact it matches the rest of the gun's finish quite well.
I don't need the gun, but since I have AR's out the wazoo my buddy might consider a trade for one of them (although he has quite a few too) and it'd mainly be for the novelty of it. If the barrel is nitrided or not will make the difference to me whether I even make him an offer. If it's untreated I have zero interest in it.