AR15.Com Archives
 Scope mounting question
AZgunnut1  [Team Member]
12/26/2011 5:19:28 PM EST
I mounted a new scope on my Barrett 99. Attempting to bore-sight it first, I discovered there was not enough adjustment in the windage knob to even come close to centering the reticle. I tried reversing the rings, to no avail. I eventually used some metal shims I bought from Brownell's a few years ago and shimmed the scope sideways. This does not seem right to me. Any hints? Bag rings? Dumb ass amateur gunsmith? Help!!!
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Dano523  [Team Member]
12/26/2011 6:00:18 PM EST
Originally Posted By AZgunnut1:
I mounted a new scope on my Barrett 99. Attempting to bore-sight it first, I discovered there was not enough adjustment in the windage knob to even come close to centering the reticle. I tried reversing the rings, to no avail. I eventually used some metal shims I bought from Brownell's a few years ago and shimmed the scope sideways. This does not seem right to me. Any hints? Bag rings? Dumb ass amateur gunsmith? Help!!!



Scope rail has 27moa built into it, so depending on the scope range of adjustment, should be fine for say a 300 yard zero of longer (bore sighing does not figure in drop at yardage for the most part on longer zeros).

As for the windage, either the rail is not true with the barrel, the scope mount is not true with the rail/barrel, or you have the scope mounted wrong, with the windage dial in the elevation position and just not enough adjustment in the windage knob to correct for the MOA adjustment on the rail.

So on that note, what scope mount are you using, and what scope as well.
AZgunnut1  [Team Member]
12/27/2011 7:19:16 AM EST
I purchased the Barrett with a Bushnell 10X scope on it, so I know that the rail is lined up and it is possible to mount a scope properly on it. I purchased a Countersniper 10-40X scope with Countersniper 35mm rings. I got a great deal on the scope. I guess you get what you pay for. My guess would be the rings. I have the scope mounted with the adjustments in the correct orientation. I have never heard of shimming a scope sideways, so it really seems wrong to me.
KRONIIK  [Member]
12/27/2011 7:02:03 PM EST

Are you POSITIVE that you are turning the adjustment turrets in the correct direction to bore-sight?

I don't know how many times I've seen guys at the range turn a windage dial "LEFT" to try and get the crosshairs to move left toward the target when boresighting.
(Doesn't work that way!)
Remember-"LEFT" on the turret indicates direction of movement of Point of Impact; exactly the opposite of apparent crosshair movement...Same with elevation-"UP" equals down.

Just something to think about in case you haven't considered that.

Good luck getting it nutted out!


woodsy  [Member]
12/29/2011 3:34:45 PM EST
Originally Posted By AZgunnut1:
I purchased a Countersniper 10-40X scope with Countersniper 35mm rings.


I found your problem right there. Replace that scope and those rings with something decent and I'm betting that your problems will go away.

AZgunnut1  [Team Member]
1/1/2012 5:51:38 AM EST
Just out of curiosity, what is the general reputation of Countersniper optics. Their Titanium series sells for some serious bucks. Of course, I purchased an "overrun" aluminum tube model for far less. The glass is clear as can be. Why the bad rap?
woodsy  [Member]
1/1/2012 4:19:21 PM EST
Do a search on the reviews of CounterSniper optics. You'll find that most of their advertizing is a scam - such as no such things as "contract overruns" because they don't have any "contracts". These scopes are well-known for not holding up.

Cheap optics = cheap performance . . . typically. The one thing that the European hunters do right is that they put their money into GOOD optics. Don't be afraid to spend some cash and get something that you can trust. CounterSniper is not one of them.
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