
Originally Posted by
krichbaum
I've had at least a couple factory assembled uppers with the gas tube binding in the gas key, for various reasons including a misaligned gas block. Sure, you can 'tweak' the gas tube to get it kind of right, but I'd rather have everything lined up so that a straight gas tube works. I ended up sending an upper back to a very highly regarded mfg to correct their misaligned gas block, and it was for this reason. The gas port wasn't blocked at all but it put enough angle on the gas tube to cause some binding...not something I'm ok with.
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