![]() Some sights may move in other directions, and that means a trip to the machine shop for repair. With this change, the sight doesn't move up and down as much with each click. Changing elevation value is done through parts replacement: and elevation post and wheel assembly with finer threads. That is too coarse to locate a group within the confines of target center. Standard issue click value is about 1½ moa. The issue elevation adjustment is done with a large threaded ring around a center post stops are controlled by the same type of ball-and-spring detent. Problems with parts fit can be perplexing, and we'll talk about those later along with some ways to gain finer adjustments. There are 10 holes on the inside flat area of the windage knob and a spring-and-ball detent to secure each click stop. That's equivalent to half- minute-of-angle (moa) graduations per click. The standard A2 rear sight is windage adjustable by a 32-pitch screw. Of course, we have to be able to see them so we can put them where they need to be. Regardless of rifle type, what makes for good sights are precision and repeatability in movement, and adequate movement increments to locate the group on center. Sights are a big part of that system as they are what guides the shooter. I call that "mechanical accuracy," and it's the guidance system for the launching of bullets. Triggers, furniture, weight and other ergonomic or mechanical elements ultimately determine the shooter's capacity to realize the performance built into the rifle. However, when we're talking about service rifles, many other issues contribute to conspire against a clean target. Given the right combination of component quality, workmanship and ammunition -what I call "technical accuracy"-they are easily capable of cleaning a high power course. From the July 2001 issue of Shooting Sports USA.ĪR-15 rifles are capable machines.
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