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AR15.COM
7/18/2010 8:14:28 AM EDT
I just purchased a PA M3 red dot sight and so far I am really happy with it.  It arrived at my door two (working) days after ordering it, even after I screwed up the shipping and they had to fix it for me.  The sight looks great and I have played with the brightness settings a bit while holding it in hand.  I can't wait to get this thing out to the range.  A big +1 goes out to Primary Arms from me.



I have a couple of quick questions about getting the sight into the mount though and I would rather ask here than guess and get it wrong.



  • When putting the sight in the mount how do you make certain that the top of the mount is aligned exactly with the top of the sight?  I know that there is no cross-hair reticle that would look crooked, but I would imagine that if this is off then when you are making windage/elevation adjustments you will be pulling slightly across the other plane with each adjustment.



  • What amount of torque do I want apply to get the sight mounted tightly in the mount so that it won't move, but without causing damage the tube?

Any help from PA or the hive will be greatly appreciated.

7/18/2010 10:23:12 AM EDT
[#1]
Place rifle on flat surface and use small level to align top of sight
to a "known, flat, level surface" on rifle.

Tighten, but don't strip screw-head.

You need to develop a "feel" for when screw has bottomed.

Again, don't strip-out the top of the screw-head (or snap the screw off below the head)

Use a small, tight-fitting screwdriver, whose blade is the widest and thickest that you
can fit into screw.

(You most likely will have an "allen-head" screw, anyhow)

Make sure thread are clean and dry (oil, grease free)

Check before, during and after every use to be sure they aren't loosening-up.

Good luck!
7/18/2010 2:01:27 PM EDT
[#2]
Sounds like we screwed up and did not out the instructions in the order.

You want it level but it is not as critical as a scope.

The main thing on the mount screws is tighten them evenly using the included wrench.

A little blue Loctite on the cross bolt nut does not hurt. Tighten it hand tight then another 1/4 turn with a wrench.

7/19/2010 3:21:03 AM EDT
[#3]
Thanks guys, I'll try that tonight.



There weren't any instructions but that is really the only question that I have.  Everything else is pretty self-explanatory.



Hopefully I'll be able to get to the range in the next week or two to try it out.



I can't wait.