One of the other big questions is concern of lug setback. How does one examine for it?
An easy, though not entirely foolproof way, is to stick a steel rod down the barrel until it contacts the bolt face. Now put the end of the rod up against something solid like a wall and press on it putting pressure on the bolt. Work the bolt. If there is fairly significant set back, you might actually feel it when you work the bolt. If it’s pretty minor, you might not so it isn’t foolproof. The only way to know beyond a doubt is to pull the barrel.
