Very well could be your rifle!
https://fnforum.net/forums/fnar/42594-top-rail-not-straight.html
https://fnforum.net/forums/fnar/42594-top-rail-not-straight.html
Scope Maxed out and Still Not Sighted in?
- Thread starter Huntolive
- Start date
- Status
Did you happen to look down the rail at your muzzle, when you had the scope and rings off? You will see it is canted if your maxing out your scopes windage. If it is canted, your only savior is a set of windage adjustable rings. I think Burris makes them with off set inserts to dial it in.
https://www.midwayusa.com/product/100885631
https://www.midwayusa.com/product/100885631
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To me the factory-installed rail does not seem to be off I even ran a yardstick down it and it seems straight although I will say it was a wooden yardstick I'd rather have a t square but nothing was way off when I looked at it best I could tellI remove the scope and mounts again since the Bell on the front was touching the rail anyway which is suspect because the other scope with the same rings which is also a 40 objective did not touch the rail
So why is it possible that the bell for 1 scope didn't quite touch the rail and the other one did I just measured them and end and they're the same exact diameter???
Are there different ring bottoms like picatinny vs. Weaver?
like could I be using rings that are just not compatible with this rail somehow?
These exact same rings worked perfectly fine on the rifle there on before
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Looking at the pics, you've got a scope canted to the right relative to the barrel.
No way you're going to have enough internal adjustment to bring things to zero.
Get a set of windage-adjustable rings and bring it physically back to center on the barrel.
(First, however, reset the internal adjustments back to zero)
No way you're going to have enough internal adjustment to bring things to zero.
Get a set of windage-adjustable rings and bring it physically back to center on the barrel.
(First, however, reset the internal adjustments back to zero)
troy fairweather
Member
40mm is the lens size the bell will be thicker or thinner expending on the scope.
yes it did seem like the scope was canted to the right I don't know how the hell that can be true though because I swear the rail does not seem to be canted so what could cause that or does it mean that the FN AR factory-installed rail is canted?
Weaver makes a cheap set of solid rngs, Grand slam, that are windage adjustable. Since the receiver rail is fixed, put a set of windage adjustable rings on it and that extra adjustment will allow the rifle to zero.
Or I could get FN to Fix issue with the rail, right?
I kinda feel like making them fix this
Even if getting the other rings is easier, they can't put out rifles like that
I will say all 3 shot groups had 2 bullets touching and all wi 1/2 inch at 50 yards and no failure s in 50 rounds
I kinda feel like making them fix this
Even if getting the other rings is easier, they can't put out rifles like that
I will say all 3 shot groups had 2 bullets touching and all wi 1/2 inch at 50 yards and no failure s in 50 rounds
In that link I posted, the base was drilled, mounted crooked. Looked like it was quite common by the amount of people that replied to the thread. I would call FN, see if they would warranty it(not sure of the policy) if not, do the ring fix.
Good luck...
Let us know .......when you actually get it back.
Yeah thanks I saw the link that was pretty scary
It just doesn't seem like the rail is actually canted though when I take the scope off.
Are there any other possibilities?
For now I have remounted the scope with higher rings and it doesn't look like it's that out of whack I'm going to shoot it tomorrow see what happens (I took this route at the moment cuz I'm trying to solve the problem while we're all figuring this out and I happen to have a whole bunch of rings hanging around). Also I'll be damned before I buy something to put on the gun before FN pays to do what they should have done in the first place I've got plenty of guns to shoot in the meantime and I'll be all over their case!
By the way how do I know how many clicks back to take it to get the Reticle back to Zero?
The scope is a pretty simple affair it's a redfield revolution 3 by 9 by 40, I think the reticle is called the accue range it's got like a little diamond in the middle and then a couple dots underneath it for elevation.
It just doesn't seem like the rail is actually canted though when I take the scope off.
Are there any other possibilities?
For now I have remounted the scope with higher rings and it doesn't look like it's that out of whack I'm going to shoot it tomorrow see what happens (I took this route at the moment cuz I'm trying to solve the problem while we're all figuring this out and I happen to have a whole bunch of rings hanging around). Also I'll be damned before I buy something to put on the gun before FN pays to do what they should have done in the first place I've got plenty of guns to shoot in the meantime and I'll be all over their case!
By the way how do I know how many clicks back to take it to get the Reticle back to Zero?
The scope is a pretty simple affair it's a redfield revolution 3 by 9 by 40, I think the reticle is called the accue range it's got like a little diamond in the middle and then a couple dots underneath it for elevation.
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You were saying the scope bell of the AG was actually touching the rail? If so THAT right there could be your issue.
Id try your higher mounts and see if it solves the issue, and if not something else you can check is dismount the rail and put your straight edge along one side of the screw holes in the receiver. see if that points inline with the barrel or across.
To recenter reticles i use a mirror in a well lit room, just put the scopes objective against the mirror and look thru it then center the reticle and "shadow"
https://rifleopticsworld.com/optically-center-scope/
That explains it, as well as the counting method.
Id try your higher mounts and see if it solves the issue, and if not something else you can check is dismount the rail and put your straight edge along one side of the screw holes in the receiver. see if that points inline with the barrel or across.
To recenter reticles i use a mirror in a well lit room, just put the scopes objective against the mirror and look thru it then center the reticle and "shadow"
https://rifleopticsworld.com/optically-center-scope/
That explains it, as well as the counting method.
I made a V-block out of a 2 x 4, with plywood ends. I just look through the scope at something, 180 it, adjust it, repeat until it lines up. ^^^^^^^^The mirror trick sounds easier!!^^^^^^^^
I just zeroed an extra scope I had in the mirror, in 30 seconds! set it in the V-block, was off a bit, but close enough. Nice tip!!
I just zeroed an extra scope I had in the mirror, in 30 seconds! set it in the V-block, was off a bit, but close enough. Nice tip!!
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cdb1
Member
It could be canted from the factory. As I stated earlier in this thread it happens:
slicksleeve
Member
Someone might have mentioned this, and you might have did it, but did you dial the crosshairs back to dead center before mounting? When I move a scope off of one rifle to another, I run the adjustment all the way to one side, then all the way to the other, while counting the clicks. Then dial it back the other way half that many. Do it with windage and height, and you should be at least starting from the middle.
illinoisburt
Member
The issue may very well be the rings do not correctly fit the rail. Picatinny and weaver are not always 100% compatable together. When you are torqued down, there should not be any space between the rail and bottom of the rings. If you see any gap, the ring is lifting and turing sideways. Get a properly fitted ring set for the rail should fix the issue.
illinoisburt
Member
If you laid a yardstick in top with the edge in the centerline of the base screws and the end is in line with the center of the barrel, then it not an issue with the base.
Yes there is a difference between picatinny and weaver. Usually not an issue, but sometimes the weaver crossbolt has enough play in the slot that the base of it lifts up or twists when tightened down leading to canted scopes and occasionally frustrating wandering zeros.
Crooked drilled base? Seen it happen....
MZ5
Member
No, it isn't. FNAR receivers are relatively thin aluminum, and the rails are screwed onto them.
On mine (Browning's BAR Hog Stalker version, which had a 2-pice Pic rail but is the same gun under the camo paint), I had a very large sighting error which was somehow fixed by magic. Taking the rail off and putting it back on aligned things correctly and thereafter I was able to sight in as normal.
Thanks for all your suggestions
I loved learning about that simple mirror trick for re-centering the scope and I did that and I'm not sure if that helped solve the problem but it's good to know and I will always do that in the future.
I'm not sure why but I think the main issue was the rings I was using somehow not locking down well in that FN AR rail.
Anyway when I mounted medium to high rings and had the scope centered everything worked out and I sighted it in with no problems although I will say that the original shots we're farther off to the left then I would normally expect them to be I did have to take it quite a few clicks to the right well in excess of 20.
But I'm still happy I have it sighted in with many clicks to spare in both directions and only had to take it up about eight clicks.
This gun shoots amazing so far cycles everything very well and bullets are usually touching or very close
I loved learning about that simple mirror trick for re-centering the scope and I did that and I'm not sure if that helped solve the problem but it's good to know and I will always do that in the future.
I'm not sure why but I think the main issue was the rings I was using somehow not locking down well in that FN AR rail.
Anyway when I mounted medium to high rings and had the scope centered everything worked out and I sighted it in with no problems although I will say that the original shots we're farther off to the left then I would normally expect them to be I did have to take it quite a few clicks to the right well in excess of 20.
But I'm still happy I have it sighted in with many clicks to spare in both directions and only had to take it up about eight clicks.
This gun shoots amazing so far cycles everything very well and bullets are usually touching or very close
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