I recently built a 74 from a K-var kit.
I bought the barrel from another on-line vendor. When I took it out to test fire it, the recoil was excessive to the point that the bolt carrier was jammed into the Tech-Sight. It was so much that it had to be pried loose.
I de-pinned the gas block and measured the barrel port,(which I should have done first). The port measured .140", which I know is too large.
My quandary is what to do. I would like to find a remedy that doesn't involve replacing the barrel. I am thinking of reaming the gas block and inserting a brass plug with the correct diameter hole.