Guys, I have a question for you. I purchased an upper from a quality company awhile back. I have 1000rnds through it, and it has always functions 100% no matter what type of ammo used. The rifle has been just for range work.
When cleaning last, I noticed the gas tube has up and down movement with finger pressure inside the upper receiver. The rifle has always functioned, and I have never taken the barrel off this one to investigate. I've looked at the gas block and barrel nut and everything looks good to go. Any worries?
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