Don’t worry, it’s just some old mustard that whoever assembled it dripped in the reciever while eating his lunch.
Probably one of those Hotdogs you can get at 7-11.
Nobody eats the hot dogs at 7-11, Tom.
It’s gold. You don’t pay extra just for the brand.. you actually pay extra because milspec require some parts to be gold plated.
Even the receiver is gold plated under the anodizing.. you’ll notice more gold showing on the brass deflector over time.
And now you know why I don’t work on AR-15’s.
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