Unertl zero

[Rookie]

My M40a1 is scheduled for delivery tomorrow. So I got the Unertl 10x out of the safe for mounting and started reading the zeroing instructions from Unertl as posted on the Hide a few years ago. They say to calc the amount of adjustment needed, and adjust the large Allen screw in the center of the turret but don't say anything about click values or turn values. They do caution against over adjustments and not needing more than 1 half to 1 full turn. Any idea? I suppose trial and error will eventually get it done but seems like a waste of barrel and ammo.

 

[Rookie]

If it's trial and error then why does it say to calc the amount of adjustment needed?

 

[6.5SH]

Might ask this in the Vintage section.

 

[smoothy8500]

I vaguely remember years ago seeing a "pie chart" that gave the degrees of rotation for the Allen wrench based on how many moa of change needed.

 

[Mike_in_FL]

My M40a1 is scheduled for delivery tomorrow. So I got the Unertl 10x out of the safe for mounting and started reading the zeroing instructions from Unertl as posted on the Hide a few years ago. They say to calc the amount of adjustment needed, and adjust the large Allen screw in the center of the turret but don't say anything about click values or turn values. They do caution against over adjustments and not needing more than 1 half to 1 full turn. Any idea? I suppose trial and error will eventually get it done but seems like a waste of barrel and ammo.

Pull the bolt and boresight the thing at 25 yards and that will put you on paper at 100 if you're not good enough to just boresight at 100.

 

[Xcount]

The allen screws are very course adjustments. Definitely do a bore sight alignment at 25 yards.

 

[RTH1800]

Steady the rifle in a vise or by hand. Fire a shot. Hold it steady while someone moves the wrench to align the CH with the POI. Done.

 

[Rookie]

Looks like it's gonna be trial and error. I'm familiar with boresighting thanks. It was zeroed once before obviously on its original home...

 

[deltawiskey]

It has been a while since I did this, but I do remember that small adjustments made pretty big changes.
DW

 

[6.5SH]

https://www.survivalmonkey.com/attachments/m40a1-pdf.53867/

The fine tune is +/- 3 MOA, some discussion and blurry but usable pics of the manual and the backside of the spanner wrench available here:

Setting up your new MST-100s - M40rifle.com

There are many ways to skin this cat, especially in adjusting parallax and zeroing, but the order of operations should stay the same (1), 2), 3)...). These

www.m40rifle.com

 

[6.5SH]

A reprint of the manual is listed for sale here:

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