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Posted: 8/29/2014 2:27:39 PM EDT
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So I've got this expensive problem child, it's an MK12 upper from Kevin at high caliber with a Trijicon 3-9 scope sitting comfortably in ARMS throw lever rings with the down sizing adapter rings.
Sighting it in today at 50yrd it's off the paper so we go to 25 and find its a barn left. So I start cranking over and I run out of adjustment and am still 6" left NOw it's a 20 shots one hole gun but it's just not where it needs to be. Any ideas? I don't think it's the scope of the gun cause its a great group you can cover it with a shell casing. Rail off maybe? Rings? Maybe the adapter size down rings? |
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I'd think it could be any number of things. Since it's actually grouping I doubt it's an issue with a loose barrel nut or something like that.
Easiest way I could think of checking would be to throw another optic on it. Anything will work, even a RDS. Zero that at 50 again. If you have to crank your windage again then it's the rifle. If not, then it's your optic setup. |
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Look at how it shoots with iron sights? Hopefully barrel is not off..
Try another ring setup, maybe the adapter inserts need to be checked for straightness...take the rear insert and rotate it 180 degrees...does it make a change? Dump the ARMS mount and try standard rings, or dare I say cut your losses and go LaRue 
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Irons do well actually. Knowing that, it puts the accuracy adjustmets back into the scope or the mount. Remount the scope in some standard rings and return the windage & elevation back to mechanical zero. Get some groups on paper. If you get reasonable results, you know its not the scope. Its more expensive than rings, and rings are simple to fix. Hopefully it does not need warranty work from the factory. |
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Quoted:
Knowing that, it puts the accuracy adjustmets back into the scope or the mount. Remount the scope in some standard rings and return the windage & elevation back to mechanical zero. Get some groups on paper. If you get reasonable results, you know its not the scope. Its more expensive than rings, and rings are simple to fix. Hopefully it does not need warranty work from the factory. Quoted:
Quoted:
Irons do well actually. Knowing that, it puts the accuracy adjustmets back into the scope or the mount. Remount the scope in some standard rings and return the windage & elevation back to mechanical zero. Get some groups on paper. If you get reasonable results, you know its not the scope. Its more expensive than rings, and rings are simple to fix. Hopefully it does not need warranty work from the factory. This. If irons are on, the issue is in the scope or mount. |
| I would bet it is the downsize adapters you have in the rings. They are probably "offset adapters", and the offset is to one side. Burris makes offset adapter rings that are intended to give you more elevation, but if they are in sideways they will throw your point of impact off to one side. |
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When did arms become shitty? They were still mil issue when I got out They always have been. They break easily, don't return to zero, they've been known to stretch with use, non-adjustable levers, etc. This is a case of just because the military uses it, doesn't mean it's a good choice. |
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well everything's redone. Strangly it appears to line up better with the irons now and it's at mech zero.I'll give it another shot tomorrow or early next week. See what happens.
thanks for the input fellas. I've looked at other mounts, I've had good luck with the Leupold M4 rings. I just prefer rings over the one piece mounts on riffles. Can't explain why just always have. |
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well everything's redone. Strangly it appears to line up better with the irons now and it's at mech zero.I'll give it another shot tomorrow or early next week. See what happens. thanks for the input fellas. I've looked at other mounts, I've had good luck with the Leupold M4 rings. I just prefer rings over the one piece mounts on riffles. Can't explain why just always have. Maybe you preference should be reevaluated? One piece cantilever mounts dominate on AR15 rifles for a reason. They work better. LaRue. ADM, and Bobro are duty ready. Accurate, repeatable and rugged to the extreme. ARMS is not even close, sorry. |
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Maybe you preference should be reevaluated? One piece cantilever mounts dominate on AR15 rifles for a reason. They work better. LaRue. ADM, and Bobro are duty ready. Accurate, repeatable and rugged to the extreme. ARMS is not even close, sorry. Quoted:
Quoted:
well everything's redone. Strangly it appears to line up better with the irons now and it's at mech zero.I'll give it another shot tomorrow or early next week. See what happens. thanks for the input fellas. I've looked at other mounts, I've had good luck with the Leupold M4 rings. I just prefer rings over the one piece mounts on riffles. Can't explain why just always have. Maybe you preference should be reevaluated? One piece cantilever mounts dominate on AR15 rifles for a reason. They work better. LaRue. ADM, and Bobro are duty ready. Accurate, repeatable and rugged to the extreme. ARMS is not even close, sorry. preferences will never change. And yup, they dominate civilian AR15 rifles. They're so much more tactical than rings. Though strangely we always did well right old fashion rings. |
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preferences will never change. And yup, they dominate civilian AR15 rifles. They're so much more tactical than rings. Though strangely we always did well right old fashion rings. Quoted:
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Quoted:
well everything's redone. Strangly it appears to line up better with the irons now and it's at mech zero.I'll give it another shot tomorrow or early next week. See what happens. thanks for the input fellas. I've looked at other mounts, I've had good luck with the Leupold M4 rings. I just prefer rings over the one piece mounts on riffles. Can't explain why just always have. Maybe you preference should be reevaluated? One piece cantilever mounts dominate on AR15 rifles for a reason. They work better. LaRue. ADM, and Bobro are duty ready. Accurate, repeatable and rugged to the extreme. ARMS is not even close, sorry. preferences will never change. And yup, they dominate civilian AR15 rifles. They're so much more tactical than rings. Though strangely we always did well right old fashion rings. Give me a break, you know it has nothing to do with being tactical.... If you want to ignore the advantages, that's your prerogative, but don't act like it's just a fad. Fyi, I have arms rings and single piece mounts. |
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