Quote Originally Posted by BPTactical View Post
Ok Belly your wrong.
There, we don't want you getting spoiled.

Seriously though you pretty well covered it. Add bending it on installation, especially if whomever did not remove the gas block. A loose gas key may do the same.
Does the end of the tube show any indicators of the key hitting it or abnormal wear to a particular side?
When i did my build i stick the gas tube in the upper first and then aligned it with the hole on front sight/gas block, mine runs fine. I might i got lucky for the first build ever.