06-27-2023, 02:12 AM
mtnlvr Wrote:I guess I just assumed you biult the upper too. My bad.No worries, a lot build their own its a good question.
There have been reports of undersized gas potrts, misaligned gas blocks, defective gas blocks, etc. You may have to dig into that if the spring doesn't solve it for you.
What brand is the upper?
My upper is a Grendel Hunter, 20in bbl 8 twist.

