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Posted: 12/8/2008 4:47:46 PM EDT
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Hopefully the title explains it. How much deviation should one expect if they remove then reattach an optic or iron sights?
I am building an M4 style flat top and plan on being able to use both optics and detachable carry handle/detachable front sight. So assuming I do not touch any adjustments how far off should I expect them to be when removing/attaching. I know it will not be the same each time. I just want to know a ball park figure so I will know my limitations. |
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Most mounts will give decent RTZ if replaced in the same slot and attached with the same force, assuming everything's clean. The benefit of using QR mounts is that the clamping force is repeatable. Most QR mounts will give similar RTZ to each other.
RTZ is a somewhat misused term. Like any mechanical component, it should have a spec associated with it, such as "will return within X MOA when remounted in the same position with the same clamping force". There's no such thing as an absolute RTZ. That brings up the question of how close a RTZ is important. Statistically speaking, very difficult to measure better RTZ than your rifle is capable of shooting. If you've got a 1 MOA rifle and a mount that will return to within 1/2 MOA, it's an essentially undetectable shift unless you shoot large groups, so there's no real difference between a 1/2 MOA RTZ mount and a 1/4 MOA RTZ mount on that rifle. A 1/8 MOA rifle and loads would allow you to measure those differences, in theory, assuming no wind. An extremely sturdy bench and gun clamp and a gridded target would do the trick as well without the wind issues. |
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