Does anyone happen to have a spare carbine tube they could measure to see how long it is?
Update in the OP.
Read your update. IMO something is still wacked with that upper. You should be able to put any reasonably well built BCG into any reasonably well built upper. Is the gas tube still protruding into the upper farther than some other uppers you've inspected? I did a quick measure comparison of 4 gas keys and they were all different internally to the internal shelf. They were all within about an 1/8" of each other. I could interchange them all.
Do the gas keys in the 2 BCG that don’t work have a carbon buildup in them preventing the gas tube from entering the key fully?
Yeah it still protrudes farther than the others. This one is about 3/4 of the way to the rear of the cutout.
This was my first thought. I don't really have a good way to clean them out. I tried a .22 bronze brush but it was stiff and felt like it would get stuck.
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