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"If you go for a new upper I'd recommend a new bcg. The lugs can wear into the old receiver extension."
I'd suggest getting a new BCG to go with the new upper. Prices have gone down considerably and frankly, re-using the old BCG is not a good idea. Actually considering the low cost, I recommend owning a complete spare BCG as a hedge against unacceptable downtime should your AR be a key component to your well being.
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