Originally Posted By Lincoln`s Wax:
Bear: is the spacer for all sight types? I told Allan that I wanted to put an AimPoint on it, and he said he'd put on the older style tritium sights with the larger rear loop as they went really well with the aimpoint, will I still need a spacer?
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PART I
Lincoln,
The spacer in conjuction with the railgrabber was designed to put the dot just above the front sight post. The size of the rear aperature should not make any difference unless the "Old Style" rear sight sits lower than a standard A2 Rear.
Here are some facts about the Aimpoint:
1. The Aimpoint is its own aiming device it is not used in conjuction with your iron sights.
This means that you do not have to line up your dot with your front and rear iron sights to shoot...you look over your iron sights and just use the red dot. This allows for quick and accurate target aquisition.
FOR FLATOP AR's
The purpose of the spacer is to allow you to fall back to iron sights in the event of a battery failure (I have not had one yet). The spacer positions the Aimpoint aperature in the correct position...where you will have the best field of view of your iron sights (centered in the Aimpoint window)...I hope this makes sense...you also will not use up a lot of elevation to zero the Aimpoint either.
If you do not use the spacer the Aimpoint will sit too low and you will be looking through the top of the Aimpoint window when shooting through iron sights (in the event of a battery failure).
When using the Aimpoint WITHOUT the spacer the front and rear iron sights will obstruct most of your field of vision and will defeat the purpose of your aimpoint (quick target aquisition)
2. Zero methods for new rifle.
a. Bring your iron sights to mechanical zero.
b. While looking through your aimpoint adjust your windage and elevation (on the Aimpoint) where the red dot sits on your front sight post while you are looking through your iron sights.
c. While using the aimpoint only (not iron sights)...shoot 3 rounds.
d. Make necessary adjustments (to your aimpoint)...and shoot 3 more rounds. Continue until your Aimpoint is zeroed.
e. Now look through your iron sights and see where your red dot is in relation to them. Adjust your iron sights (bring your iron sights to the red dot...do not adjust your aimpoint). The red dot should be half way above your front sight post.
f. Turn your aimpoint "off"...but leave it mounted on the weapon system.
g. Shoot 3 rounds looking through your iron sights.
h. Make adjustments (if necessary) to iron sights to ensure point of impact is the same as when you use your aimpoint