I have a 10.3 DD. Ballistic advantage gas block. BCM BCG and carbine length gas tube. I checked alignment and it’s perfect. I’m at a loss
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I also have the 6 position A5 tube... but that is not the issue of course
What ammo are you using?
Is this a newer .070" gas port DD barrel or the older .080 port size? Like the poster above me, I'm curious which ammo you're shooting. I have a MK18 upper with the newer barrel and it prefers 5.56 ammo, especially in the cold.
NO Law.... The reason I am at such a loss is that I have built many rifles... never had an issue. The only thing I have done different is that I am using different manufacturers parts, as explained above, a green sprinco (Rifle length), and a mil-spec trigger. I am going to shoot the upper with another lower to see if it works. I will change the BCG... it is just guess work at this point.
He also noted that was dimpled for MK12 gas block... would that be the issue? It has a BA gas block... doesn’t add up but...