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To the OP.
Make sure the barrel steel is 4150, the bbl, bcg is MPI and HPT tested (denoted by a HP,MP stamp) and that if you are going to go with a 16" upper that the bolt has a five coil extractor spring, black insert and "o" ring around the spring. Also make sure that the Chamber is 556 Nato.

-DM-
 
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