Upper (full) replacement & gas/buffer related questions.

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AR 20” H-Bar:Upper replacement:Buffer tube etc
Hi all! I have a friend in the process of replacing an older Windham Arms, sport, H-Bar, 20” barrel, (no muzzle device) in 5.56 w/ a newer upper in the same caliber. What considerations could you offer regarding barrel lengths, buffer tube & gas components? What is the lowest length barrel that could be used with this long DI gas system rifle (AR-15) in 5.56? Lastly, any ideas regarding a good choice for an upper/w barrel? Mid price range? Many thanks for your sharing! Be well.
 
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