I'm talking about the extra screw in a lower that's supposed to push up on the rear lug of the upper and tighten the fit between the two halves. These non-standard add on gizmos are a new topic for me and being the noob that I am I'm not able to tell if it's a good idea or just shinola.
What's the real deal? Can this improve precision? And if so where does it fall in the list of important stuff?
What's the real deal? Can this improve precision? And if so where does it fall in the list of important stuff?