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Posted: 11/10/2006 11:32:23 AM EDT
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Ok, here is the scoop. I am a fairly new armorer for my dept. and I am currnetly tasked with serviceing rifles and carbines that havent been inspected in about 2-3 years. Everything is going fine. My quesiton is I have an Officer who's elevation wheel on his rear sight is extremely loose, you accidently brush it with you hand or body and it moves up or down a couple of clicks. Well what would be a good fix for this? I was thinking of replacing with new components. But now that Officer is concerned with it haapening again and so am I. What about pinning the elevation wheel in place so it doesn't turn? Or How about a little locktite just to snug it up a bit? If I had my way we would all go back to the A1 Sights! Thanks guys for any input. James |
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First off, check the Allen screw that holds the top number section part of the dial with the detent lower section that raises/lowers the housing itself. Dial set to three, and Allen tool down the front hole into the setscrew. From there, you will need to check the dial detent and pin and the detents in the elevation knob. To do this, you will need to drive out the cross pin, which will release the inner large spring down out the bottom of the threaded portion of the housing. From there, you will start raising the housing in the receiver, and catch the cant detent and spring when it clears the left hand ear of the upper receiver it's self. With the housing out, the dial can be slide out, and the dial detent and spring for the dial can be pulled. Check not only the detent and spring, but also the detents in the dial itself for wear. From there everything will go back the same way you pulled it out, and as for the large spring, slot a wooden dowel so you can push the spring back into the threaded section of the housing, and drive the cross pin through to retain the spring/ limit the amount upward travel of the housing. Now to point out, this is all M-16 basic 101 smithing, and since this simple correction is beyond your means, do the department a favor and take a Colt AR-15 course before you touch any of the department rigs!!!!! |
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Now to point out, this is all M-16 basic 101 smithing, and since this simple correction is beyond your means, do the department a favor and take a Colt AR-15 course before you touch any of the department rigs!!!!! Thanks, for the reply. I have taken a M16 armorer's course. All the components of the rear sight are actually quite servicable! The question is why is still so easy to turn the elevation dial. The parts show very little wear! could be poor fitting parts im guessing. |
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Best guess why the knob is turning so easily, Is either the knob detent spring is too weak/failed, Or the detent tip is worn and not locking into the dial detents on the bottom of the knob. You haven't stated what brand upper this is, but will all the half ass tempered/hardened detents that I have seen over the years, if he has been cranking on the dial a bit, may have just worn the detent pin tip out if the knob detent was questionable from the beginning. Bottom line is the sight housing and elevation knob can be pulled in about a minute, and it will obvious what part is worn with them in hand out of the upper. 
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