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Posted: 12/3/2012 6:38:52 AM EDT
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New here and new to AR15's. I am having problems getting it sighted in. The rifle has a POF P4x rail and Rock River mounts, installed a Bushnell 3200 4-12x40 AO. My problem is that it is shooting to high and I run out of adjustment on the scope. Could it be that the scope is sitting too high? I would like for it to be lower, as close to the rail as possible, but am unsure what rings I should use. Any help/criticism/suggestions welcome.
Thanks |
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We need to do process of elimination between parts. I had this happen to me once on a 30-06 bolt action.
Don't know the products you mention, as to how good they are, but I'm sure they are, but mistakes in packaging happens. If you have something like a straight-edge to use, it helps, but not necessary. 1: Look to see if the scope rails are "Canted" down towards rifle barrel. This puts the scope looking down and rifle barrel going up. Slightest "Cant" on the AR "Receiver" throws everything off. For the AR platform, you need a "Level Top" on rail, without any sloping down to front. Change out Receiver Rail mount if this is case. 2: See if scope rings ARE EVEN in heigth. This is what happened to me as mentioned above. New Rings(in package), but one ring was shorter than other. Didn't notice of course, until scoping in, that rifle wasn't able to hit bullseye closer than 200yds. Finally looked from side view and noticed scope canted(way down). Change out Scope Rings. You CAN try and also reverse front ring with rear ring, and remount to see if this could alleviate problem. Done this a few times and it's worked for me. If rifle now shoots low after switching ring mounts, then you need to change ring mounts altogether for new ones. 3: If your Scope is setting up too high, they YES, you will have a problem with closer range sight in. This is because the scope's crosshairs, and barrel IS NOT on a plane that allows bullet to intersect at ranges that you wish to shoot. That's why scopes need to be mounted as low as possible, on in such a way that A/O type scopes just clear the barrel. OR you have the proper Adjustable Scope Rings(Burris Signature Zee) to take out this problem, without changing out rails, bad mounted barrels, poorly drilled receivers, or Elevation/Windage problems. Burris also makes these type rings in a QD format, if you want to take scope on/off. 4: If everything checks out, and seems good, then look to scope, as it's possible the Elevation knob, or scope's internals aren't working properly. Those Bushnell Elite scopes are excellent scopes. Hope info works, and you quickly find problem and it's a cheap resolution. Del |
| This may sound simple, and I am in no way insulting you, but I had a buddy of mine overthinking his scope. He was thinking the "up" on the knob was moving the reticle up. He thought he couldn't sight in and ran out of adjustment. After I explained that that "up" was moving his shot up he was able to make his adjustments and zero the rifle. Just a noob mistake. |
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If the scope were too high, the bullet would impact low (see the barrel is under the scope), so thats not your issue.
Note, the elevation turrets are marked to change the bullet impact, so if it says UP, its not moving the reticle up, its moving the impact on the target up. Moving the reticle up would lower the impact. |
| I appreciate all of the suggestions, I think I have the problem solved. After checking everything again as far as proper installation etc..it seems as if I was overthinking the scope some have suggested along with trying to sight it in at a shorter distance at the house with a laser. After playing with the laser at at short distance and slowly moving it up sighting in objects at at longer distance I noticed there was a point at which the laser and the crosshairs met. That was a good lesson as I could actually see what was going on in regards to distance. I should have looked at it longer before coming here and bothering you guys but do appreciate being pointed in the right direction. I have never had this problem with my bolt rifles, still trying to figure that out. |
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