I only have Colt uppers because over the years I’ve found them to be the most consistent about the irons zeroing closest to center.
When one is off a few clicks to the left it van usually be resolved by disassembling and properly reassembling the upper.
I would skip Colt because their customer service is known to be poor and extremely slow.
John Thomas at Retro Arms would be my first choice for a fix. Ken Elmore at Specialized Armament can fix it too but my be as slow as Colt.
Ya know I factored that in as well. I chopped my 6933 barrel down to 10.3 , also running a NT4 suppressor. With that said , it rain smooth and hardly any gas in the face. Looked at the FSB where the gas port is I notice it is bleeding off around the barrel. So it’s more then likely not aligned right , but because of that the rifle isn’t over gassed and it almost acts as a gas block adjustment. For what it’s worth it’s perfect where it’s at as strange as it sounds? Now as to how it will affect the rifle in the long term ? We will see.
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