Nope and Nope. For every complete turn of the barrel the head space moves .050". 1/4th of that is .0125" the range of adjustment from no head space to maximum head space is 1/10th of a turn or about .005.do the factory stamps ever line up as they should on the left side or am i just setting it too tight ?
The stamping on the barrel is random and is contingent on the bolt head and the actions and barrels threads. Why worry about it unless you are trying to fool someone.
Bookmarks