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I should have been more clear with my question. What's the best configuration for a C7 upper receiver with the H&R lowers that have been released? The M16A2 COTS receiver with a 14.7” barrel is what comes to my mind first but wanted to know if there are any other configurations to consider. The Gordon is cool and I might go that route. Don’t think I can make an accurate Canadian C7 rifle clone with that’s available.
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I see, if you’re trying to make the most accurate clone possible with this lower and a C7 upper the 723, 733 or M16A2 are options.
The lowers these are modeled after were sold commercially, so any rifles made for the commercial market during a certain period could have this combo. Colt was well known for using what they had on hand rather than adhering to a strict combination.