AR scope mount HELP!!!

[rogers017]

So I finally got to go to the range to sight in my AR. I have a Redfield Revolution
3-9X40mm with a set of 1" high scope rings. I sighted in @ 50 yards, and everything was fine. Went to 100 yards, and POI went 2 o'clock high, out to inside edge of the 8 ring. I went to adjust the scope back in, and found out that I was out of horizontal adjustment.

This is my first AR build, and my first scope that I mounted. I didn't lap the rings, but now i'm not sure if this would help. Anyone have any suggestions?!?!?

[skidout67]

I don't have any experience with this scope, but what I would do first would be to take it completely off, rings and all, and remount it all, using similar torques on both ring mounts. It doesn't seem right that you would have to be all the way over on your horizontal adjustment to center shots at 50 yards. Obviously the scope/ring combiniation isn't aligned to the bore of the barrel. Try to picture it twisted slightly left or right. Hope this helps.

[bombadillo]

I'd buck up and get a Burris PEPR QD mount and call it a day. I know you already have the rings but its worth it.

[ExtremeX]

Assuming the rings you are using are of decent quality, keep them. I really like Warne rings if you want separates, and plenty of 1 piece options out there too... But lets just work with what you have first.


Ive used that scope before, grats on your purchase. You should have about 70 MOA of windage and 70 MOA of elevation correction on that optic, with about 3.5" of eye relief.

First, a picture of your existing setup...

Are the front & rear rings both attached to the upper receiver, not mounted to the hand guard rail if you have one? That right here could cause the type of issue you are experiencing. If you are having issues with eye relief and getting both rings on the upper only, then a new mount might be the answer.

Did you use a torque wrench when mounting the rings to the scope? Hand tight is usually too tight and you are never going to be able to apply even torque. You should also tighten the screw as you would a car tire, never torque 1 lug down all the way before the others, do a little at a time.

It would be wise to remove everything, and start over if you didn't do any of the 2 above steps. If you don't have a torque wrench in inch/lbs, buy one or find someone that does.

With 70 MOA of windage, it sure sounds like a torque or mounting issue unless you have a bad copy of that scope and its not tracking correctly.

Make sure you get the crosshairs as vertical as you can get them, I usually use 2 separate bubble levels to do this. Play with eye relief, mounting, personal comfort, all this stuff before mounting and firing a shot. Saves you time and ammo getting it right so you don't have to keep removing your rings.

[Guapoh]

I'd buck up and get a Burris PEPR QD mount and call it a day. I know you already have the rings but its worth it.

+1

[rogers017]

I'd buck up and get a Burris PEPR QD mount and call it a day. I know you already have the rings but its worth it.

I will look into them, thanks.

Assuming the rings you are using are of decent quality, keep them. I really like Warne rings if you want separates, and plenty of 1 piece options out there too... But lets just work with what you have first.


Ive used that scope before, grats on your purchase. You should have about 70 MOA of windage and 70 MOA of elevation correction on that optic, with about 3.5" of eye relief.

First, a picture of your existing setup...

Are the front & rear rings both attached to the upper receiver, not mounted to the hand guard rail if you have one? That right here could cause the type of issue you are experiencing. If you are having issues with eye relief and getting both rings on the upper only, then a new mount might be the answer.

Yes, both rings are on the upper, not the handguard

Did you use a torque wrench when mounting the rings to the scope? Hand tight is usually too tight and you are never going to be able to apply even torque. You should also tighten the screw as you would a car tire, never torque 1 lug down all the way before the others, do a little at a time.
I did not use a torque wrench. This is my first mount, didn't know I needed to. I just snugged it down hand tight, so that may be my problem.

It would be wise to remove everything, and start over if you didn't do any of the 2 above steps. If you don't have a torque wrench in inch/lbs, buy one or find someone that does.

With 70 MOA of windage, it sure sounds like a torque or mounting issue unless you have a bad copy of that scope and its not tracking correctly.

Make sure you get the crosshairs as vertical as you can get them, I usually use 2 separate bubble levels to do this. Play with eye relief, mounting, personal comfort, all this stuff before mounting and firing a shot. Saves you time and ammo getting it right so you don't have to keep removing your rings.
They look level, I didn't use a bubble tool, but put a small level I have on the top turret and leveled that way.

Thanks for the help guys, it gives me a great place to start looking for whatever is causing me this issue. One more thing. The ring bases were VERY tight when I installed them on the rail. I had to take them apart, and realy push them down to seat them. I'm beginning to think they are the cause, and will probably end up swapping them out.

[ExtremeX]

The ring bases were VERY tight when I installed them on the rail. I had to take them apart, and realy push them down to seat them.

That right there should raise a red flag for you...

Anything that you attach to your rail should move freely until you actually lock them down. Did you attach the rings to the rail then torque down the scope?

If your rings are really that bad and its not your process of install, I am just going to agree with the others, go with that Burris mount or get some quality 2 piece rings from Warne, they cost around the same. If you plan on taking it on and off all the time to switch with another optic then there are still better options, but they cost more than your scope.

[HK Dave]

I'd buck up and get a Burris PEPR QD mount and call it a day. I know you already have the rings but its worth it.

+2!

[ExtremeX]

For whats its worth, my recommendation is to go with the Standard Burris mount if you don't plan on taking it on and off, not the QD. I have the QD version and I just don't trust it anymore, after repeated removal/mounting it goes out of spec and starts to loosen up. For anything QD I buy LaRue.

I tested the 30mm version with a 4-16x50 scope and after remounting it was about a 1-2 MOA shift.

[negolien]

Pics help alot but I agree with the pepr that's what I have.