Finally got to finish my latest AR build, it's been in progress for nearly 2 years... :/
Gas tube wouldn't line up with the gas key. It started out moving the gas tube up a bit by the barrel nut. After a little light bending, I was able to get rid of that movement, but then it would jam up the last 0.25" and the only way to get the bolt to close was with the forward assist. Well that's not good. Kept tweaking it with light bends and finally got it to close perfectly. The gas tube doesn't even move now when the BCG slides forward. Wish my scope mount would arrive so I can take it to the range and test fire it!