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AR15 vortex viper sight adjustment issue

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/25/2011 at 14:31
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I took out my ar 15 to the range for the first time since mounting my vortex viper 2-7x last weekend.  I had it mounted  and boresighted on a burris AR PEPR scope mount.

When I started to sight it in it was about a foot low at 50 yards.  I adjusted my scope up and the adjustments maxed out about 5 inches below my target.  I could turn the knob but it was obvious the adjustments no longer had an affect.
 
I called the manufacturer of the gun because I was told the barrell might be misligned with the upper receiver.  The told me there would hardly be any chance of that and to check with the scope manufacturer to see what they might think.  I will call Vortex this weekend but thought I would post here first while I am at work.
 
If I do not get any leads, I will have someone else re-check the mount and start from scratch.
 
When shooting iron sights my gun shot fine.  This leads me to believe that the barrell  being misaligned with the receiver is not likely.
 
Any ideas?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/25/2011 at 19:13
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It could be the barrel or the scope or the mount or a little bit of both.

Iron sights do not really help with this, but if you have another scope/mount to try that would be the best test.

ILya
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/25/2011 at 22:34
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I know this is a stupid question,but did you check to see if all the screws were tight?Also check to make sure the screws going into the receiver & picatinney are torqued to the correct poundage!

Edited by stickbow46 - March/25/2011 at 22:35
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/27/2011 at 22:26
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what mount were you using?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/28/2011 at 09:07
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Burris PEPR
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/28/2011 at 09:17
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sorry i somehow missed that last night half asleep....  Did you torque them with awrench or just freehand?

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/28/2011 at 10:25
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LOL I am not very knowledgeable about setting my own stuff up.  I had it mounted at a gun shop.
 
I guess I will take it somewhere to get checked out.
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/28/2011 at 10:28
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Originally posted by txhunter2 txhunter2 wrote:

LOL I am not very knowledgeable about setting my own stuff up.  I had it mounted at a gun shop.
 
I guess I will take it somewhere to get checked out.
 


i took  my old rem 721 to a gun shop to buy a new scope... ended up needing new rings and mounts as well.  they did it all for me and boresighted it... and after the first round down range, the damn rings were rattling on the mounts.

listos: don't take for granted your gun shop either knows what their doing, or didn't miss something.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/28/2011 at 10:30
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Originally posted by Dyelynn Dyelynn wrote:

Originally posted by txhunter2 txhunter2 wrote:

LOL I am not very knowledgeable about setting my own stuff up.  I had it mounted at a gun shop.
 
I guess I will take it somewhere to get checked out.
 


i took  my old rem 721 to a gun shop to buy a new scope... ended up needing new rings and mounts as well.  they did it all for me and boresighted it... and after the first round down range, the damn rings were rattling on the mounts.

listos: don't take for granted your gun shop either knows what their doing, or didn't miss something.

sounds to me like they didnt use a torque wrench to tighten stuff up.Shocked
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/28/2011 at 10:32
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You dont' need a gun shop, just a good torque wrench.  Weaver sells one and it has multiple attachments.
 
Weaver Optics Accessory Weaver Optics Accessory
Stock # - WEA849728
  • Torque Wrench
$49.95 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/28/2011 at 10:55
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i'm not sure what he did or didn't do.... i do know that a flat head screwdriver fixed it in a jiff.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/28/2011 at 10:58
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Originally posted by Dyelynn Dyelynn wrote:

i'm not sure what he did or didn't do.... i do know that a flat head screwdriver fixed it in a jiff.

what???? were you using weaver style rings??? all of my stuff uses torx head screws.


Edited by pyro6999 - March/28/2011 at 10:58
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/28/2011 at 11:00
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Originally posted by pyro6999 pyro6999 wrote:

Originally posted by Dyelynn Dyelynn wrote:

i'm not sure what he did or didn't do.... i do know that a flat head screwdriver fixed it in a jiff.

what???? were you using weaver style rings??? all of my stuff uses torx head screws.


i haven't gotten to rings and bases yet pyro... let me finish deciding on a scope first...
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/28/2011 at 11:01
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Originally posted by Dyelynn Dyelynn wrote:

Originally posted by pyro6999 pyro6999 wrote:

Originally posted by Dyelynn Dyelynn wrote:

i'm not sure what he did or didn't do.... i do know that a flat head screwdriver fixed it in a jiff.

what???? were you using weaver style rings??? all of my stuff uses torx head screws.


i haven't gotten to rings and bases yet pyro... let me finish deciding on a scope first...

im confused now, you said earlier that they mounted every thing up  on your 721 and you went and shot it, and it rattled right away????

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/28/2011 at 11:08
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Most likely culprit I believe is the mount. The fact that the scope has a fairly limited amount of internal adjustment makes this more obvious. Least likely would be the alignment of the barrel most manufacturers of AR's are pretty good at putting them together.
Solutions are:
Select a scope with a lot of internal adjustment like Super Sniper 6x42
or
select a mount that is more likely to be correctly made like La Rue
or
shim the rings on the mount you currently have to adjust the angle of the scope within those rings, while this is the cheapest route it does sound like a half ass fix but this has been done for years. You can cut a small piece of an aluminum pop can and place it under the bottom of the scope within the the back ring. When tighetning the screws on the rings use a torque wrench.
 
Warne 25in/lb T-15 Torque Wrench Warne 25in/lb T-15 Torque Wrench
Stock # - TW1
$21.95
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/28/2011 at 11:08
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when i got the 721, it had a redfield widefield on it, that was probably nearly as  old as the rifle.  after i bought my son's tikka, i decided i liked the new redfield scope i put on that for him enough to buy one for myself.  so, knowing nothing about rings, bases, or mounting a scope and bore-sighting it... only that you need to, i took the rifle with me to the store to buy the scope.

the scope wouldn't fit on the rings i had, the older scope was a bit longer (if i remember), so they had to put some offset rings on it... or maybe it was offset bases.  when i got to the range, i fired 1 shot and as i was loading my second round, noticed that the scope was loose on the bases.  the rings were tight, but the rings on the bases were not.  where the rings mount to the base is one large wheel nut on the left side for each of the rings (i think i've been told those are weaver style).  these were the problem, and after the flat-head fix, everything works fine.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/28/2011 at 11:13
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Originally posted by Dyelynn Dyelynn wrote:

when i got the 721, it had a redfield widefield on it, that was probably nearly as  old as the rifle.  after i bought my son's tikka, i decided i liked the new redfield scope i put on that for him enough to buy one for myself.  so, knowing nothing about rings, bases, or mounting a scope and bore-sighting it... only that you need to, i took the rifle with me to the store to buy the scope.

the scope wouldn't fit on the rings i had, the older scope was a bit longer (if i remember), so they had to put some offset rings on it... or maybe it was offset bases.  when i got to the range, i fired 1 shot and as i was loading my second round, noticed that the scope was loose on the bases.  the rings were tight, but the rings on the bases were not.  where the rings mount to the base is one large wheel nut on the left side for each of the rings (i think i've been told those are weaver style).  these were the problem, and after the flat-head fix, everything works fine.

ah so, yeah, those are weaver style. it all makes sense now.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/28/2011 at 12:27
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Dyelynn - glad that you were able to fix your rig but he has a scope mount that looks like this and there is no place to use a flat head screwdriver on it.  The idea is the same however make sure the bolts secure it to the rifle are tight not over tightened but certainly not loose.  
Burris AR-P.E.P.R. 1 Burris AR-P.E.P.R. 1" Scope Mount
Stock # - 410343
  • Matte
  • Picatinny Tops
$69.95


Edited by Urimaginaryfrnd - March/28/2011 at 12:32
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/28/2011 at 12:34
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nope, no place for a flathead... but those look like 1/2" nuts on there... maybe 3/8"... same scenario though, they can be loose, and just need to be tightened...
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/28/2011 at 13:31
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True but I suspect he will have to shim the scope to change the angle enought to zero it or switch scope or mount. Personally I would probably switch scope and go to a 6x42 Super Sniper.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/28/2011 at 13:51
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sorry, i didn't see this post... so i was still having one conversation and you'd moved on to another already...

Originally posted by Urimaginaryfrnd Urimaginaryfrnd wrote:

Most likely culprit I believe is the mount. The fact that the scope has a fairly limited amount of internal adjustment makes this more obvious. Least likely would be the alignment of the barrel most manufacturers of AR's are pretty good at putting them together.
Solutions are:
Select a scope with a lot of internal adjustment like Super Sniper 6x42
or
select a mount that is more likely to be correctly made like La Rue
or
shim the rings on the mount you currently have to adjust the angle of the scope within those rings, while this is the cheapest route it does sound like a half ass fix but this has been done for years. You can cut a small piece of an aluminum pop can and place it under the bottom of the scope within the the back ring. When tighetning the screws on the rings use a torque wrench.
 
Warne 25in/lb T-15 Torque Wrench
Warne 25in/lb T-15 Torque Wrench
Stock # - TW1
$21.95
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