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Posted: 8/17/2011 9:55:34 PM EDT
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I've been running an XPS on my RR AR. Shoots great, no failures, no issues until (dramatic music here please) I returned to the range today and found my 50 yard zero was a goner.
Easy enough to fix and as long as I don't pull it off to show someone how slick it is I anticipate it'll stay true. My question- When such a thing happens- what exactly is changing? The mount? Something inside of the sight itself (which is unsettling)? Does it mount onto the piccatiny rail just ever so slightly off? Did my ninja jedi black belt cat (he's spec ops) zero it to his bazooka? It's mounted straight to the flat top- no shims, stacks, or anything besides the thumb screw base. What's your bet? Thanks. |
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It has been my experience that ANY change in the "thumb screw" tension will cause the sight to lose zero.
The operative word is "thumb screw". It promotes the thought that this sight can be adequately tightened to the rail with no tools. This is not the case! It will loosen up eventually and cause you all kinds of grief with changing zeroes until it gets loose enough for you to notice. Ask me how i know  .
Tighten that sucker down with a screw driver with a little blue locktite. You should be good to go from now on. |
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Quoted:
It has been my experience that ANY change in the "thumb screw" tension will cause the sight to lose zero. The operative word is "thumb screw". It promotes the thought that this sight can be adequately tightened to the rail with no tools. This is not the case! It will loosen up eventually and cause you all kinds of grief with changing zeroes until it gets loose enough for you to notice. Ask me how i know .
Tighten that sucker down with a screw driver with a little blue locktite. You should be good to go from now on. +1 thats why i run the ggg accucam it allows return to zero when removed and re mounted, and supposedly bobro is coming out with a qd mount soon I sugget getting a qd mount and using the hex screw to tighten it to the mount and use the mount to remove it |
| Never had a problem moving my 556.A65 with thumb screw mount back and forth between two different carbines. Maybe a slight MOA change in zero, but not anything noticeable. Would I rely on it for head shots at 300m without rezeroing? No, but it was good for general use. |
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All good thoughts Thanks.
A few replies... The shots were off about 10" at 50 yards. And I was using.... Wolf Ammo. Yep, crappy, cheap, hazardous, 3rd world polluting Wolf Ammo. Now Wolf is never talked about when accuracy is a topic but even w/ the occasional wingers I couldn't attribute the inaccuracy to the ammo alone. So thanks everyone. I'll get some good ammo and will properly tighten the sight and not screw w/ it anymore! -ODThedan |
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