I was watching that one out of curiosity. The seller is local and has had a few rifles for sale lately. 15’ away it looks nice. Up close there is a lot of issues. Most of the parts have a problem. The receiver is almost certainly welded, machine lines don’t line up. The stock is cracked. The gas cylinder is cut. Not much left to work with.
Nothing wrong with the cut in the cylinder, done at the arsenal.
Former Prairie Submarine Commander
"To Err is Human, To Forgive is Divine. Neither of Which is SAC Policy."