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9/16/2014 11:18:48 PM EDT
I have a really stupid noob question for the hive. And yes i did try google.

I purchased a primary arms red dot for my wifes new AR, and i got a high cantilever mount for it. My question, is this: Am I going to have to adjust the red dot down a bunch to compensate for the higher mount? It seems like the dot is a bunch higher than it should be. I dunno though - ive never used a red dot sight before this one. Im sure that it will be fine, this is probably just something else for me to be paranoid about.

Any input at all will be greatly appreciated.
9/17/2014 6:31:05 AM EDT
[#1]
The short answer is no.



The height of the mount is to bring to the level of the front sight.

You should be able to see the sights through the lower third of the optic.

The advantage of red dots is they work no matter where the dot is seen in the tube.


9/17/2014 9:04:06 AM EDT
[#2]
The answer is above.  I have a question for OP.  What red dot did you get that needs a mount?  Are you talking about needing a riser?  PA usually has info on its site regarding which risers it recommends with specific dots to get the customary lower 1/3 cowitness or the alternate (my preference) absolute cowitness.
9/17/2014 9:09:58 AM EDT
[#3]
Sounds like he either got a classic 30mm or the other 30mm dot they have.
9/17/2014 11:11:08 AM EDT
[#4]
It is the classic 30mm. And I understand the concept and advantage and what not,  but the rifle it is on does not have any irons at all.  Just a flat top. What's the best procedure to zero it with no front sight?
9/17/2014 11:26:09 AM EDT
[#5]
Go to the range and just adjust the dot until POA = POI at 50 yards. You'll be good.
9/17/2014 2:40:46 PM EDT
[#6]
Quoted:
I have a really stupid noob question for the hive. And yes i did try google.

I purchased a primary arms red dot for my wifes new AR, and i got a high cantilever mount for it. My question, is this: Am I going to have to adjust the red dot down a bunch to compensate for the higher mount? It seems like the dot is a bunch higher than it should be. I dunno though - ive never used a red dot sight before this one. Im sure that it will be fine, this is probably just something else for me to be paranoid about.

Any input at all will be greatly appreciated.
View Quote


It will be close out of the box even with the high mount. Easiest way to make sure is to take the upper off and remove the bolt. Put upper on the bench. Look down the bore and move until it is on the target. Adjust the dot to be on the same spot. Reassemble and fire to dial in.
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