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The code or symbol stamped on the stripped upper receiver usually indicates which forge it came from. I'm not familiar with that code but usually you see a keyhole for Cerro Forge, bird head for Cardinal Forge, splintered A for Anchor Harvey Forge or square for Brass Aluminum Forge.
Anyway it shouldn't indicate BUshmaster or FN, though ArmaLite does have their own symbol on their upper.
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