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How can I tell what type of AR upper I own ?
What markings should I look for to identify manufacturer ?
Any help would be appreciated.
I have owned this upper since early 1990's
There weren't nearly as many AR manufacturers then as now. Uppers usually don't have a lot of manufacturer info. The barrel engraving might give you some info. The upper receiver should have a forge proof mark and might have some other info. Post some pics of any markings.
There should be some small letters, usually by the sight. What are they? As mentioned, real close pics are helpful. As for A1, A2, etc. if that is what you mean by type, does it have an elevation ring or not. Does it have a forward assist?
If you can find a name, and you probably won't, that's it. There are some symbols as to which forging company made the blank, but that won't tell you a thing about who machined or assembled it. So you could have a genuine Colt upper and wouldn't know.
Basically, you induce a magnetic field in the part and then sprinkle iron dust/particles on it. Any surface or slightly sub-surface cracks in the part will cause a discontinuity in the magnetic field and the "dust" will be attracted to it.
It's like dye penetrant testing but with magnetic particles, if that helps.
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