Faxon - qpq nitrided barrel question

[just_john]

foxman - most set screws are machined with a slight recess on the face of them. THis creates kind of a biting edge that will cut into the metal surface that it is tightening against. As stated above, crank 'em down a little extra and that edge will make its own dimple. Just be sure that it is in the right place, first!