Quoted:
what upper you have there Alpha-Romeo?
Nice looking shooter!
I'd go with the Middy also
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My middy upper started out as a Colt 6721 tactical carbine M4 upper with the stock H-BAR barrel and after test firing it stock, I decided to replace the barrel with a new mid length gas system barrel.
The barrel is a mid weight contour Rockcreek (Mike Rock), Mil-Spec chrome moly vanadium, chrome lined, 1/7, M4 feedramps, high pressure and MP tested "Operator" from Denny's Guns (Global Tactical Supply).
My new mid length, mid weight barrel made my 6721 handle better and easy to carry around because of the lighter barrel, I really don't prefer H-BAR barrels.
I also replaced the handguards with LaRue 9.0 rails. I'm also using a Colt M16 BCG with Wolff extra power extractor spring.
My other CAR M4gery upper is made by LMT.
Both my carbines shoots fine but the middy feels a little smoother and is my favorite so far.