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How to do rear sight adjustments on MKII Target?

This is a discussion on How to do rear sight adjustments on MKII Target? within the Ruger Rimfires forums, part of the Pistol & Revolver Forum category; Admittedly a newby question but "You won't know if you don't ask..." I have MK II Target with the adjustable rear sight. (Actually the front ...


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Old November 8th, 2009, 05:46 AM   #1
 
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How to do rear sight adjustments on MKII Target?

Admittedly a newby question but "You won't know if you don't ask..."

I have MK II Target with the adjustable rear sight. (Actually the front sight has a screw so I assume that it is adjustable as well.)

The rear sight has three screws for adjustment. A larger one on the top, a smaller one on the top (to the left of the larger one) and a smaller one on the right side (the right side as you are holding the gun).

I can't find anything (not even in the manual that came with the gun!) that defines what each screw is supposed to adjust.

I'm hoping that someone here can help me...

Thanks,

Bob



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Old November 8th, 2009, 06:37 AM   #2
 
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If you look on the right side of the sight, that is the screw that adjusts windage. There is a screw on top that adjusts elevation.

The screw on the front sight doesn't adjust anything; it simply holds the front sight on the gun.

I'm looking at page 40 of the Owner's Manual which shows a blowup of the gun parts. Also, refer to page 31 for some help on which way to turn the adjustment screws, something I always seem forget. Clockwise on the elevation screw LOWERS point of impact and clockwise on the windage screw moves the point of impact to the LEFT.

Hope this helps!

Last edited by Tater; November 17th, 2009 at 04:49 AM. Reason: error in text
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Old November 8th, 2009, 08:33 AM   #3
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Adjustable sights work the same on all guns. The rear sight moves in the same direction as the bullet's point of impact (POI). In other words, if you are shooting low, you want to raise the POI by moving the rear sight up. If you are shooting right, you want to move the POI left by adjusting the rear sight to the left.

Some rifles have an adjustable front sight and some handguns have front sights mounted in a dovetail. Front sights are adjusted in the opposite direction of POI. In other words, if your gun was shooting right, you want to move POI to the left by adjusting the sight to the Right. If the gun was shooting low, the front sight must be adjusted lower to raise POI.

How much sight adjustment is needed to move POI? That depends on your sight-in distance and the sight radius (distance between front and rear sights). To calculate, convert "distance to target" into inches then divide the sight radius by distance. Example: let's say you wanted to sight in your pistol at 25 yards. That would be 900 inches. Let's say your sight radius is 9". 9/900=.010" So, each .010" of rear sight movement will move POI by 1 inch at 25 yards.
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Old June 5th, 2010, 07:45 PM   #4
 
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Quote:
Originally Posted by Tater View Post
If you look on the right side of the sight, that is the screw that adjusts windage. There is a screw on top that adjusts elevation.

The screw on the front sight doesn't adjust anything; it simply holds the front sight on the gun.

I'm looking at page 40 of the Owner's Manual which shows a blowup of the gun parts. Also, refer to page 31 for some help on which way to turn the adjustment screws, something I always seem forget. Clockwise on the elevation screw LOWERS point of impact and clockwise on the windage screw moves the point of impact to the LEFT.

Hope this helps!
Please tell me what the third screw is for....the little one on the top of the rear sight. No one answered that part of the original question. thanks!
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Old June 5th, 2010, 08:20 PM   #5
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It's a set screw that holds the rear sight in the frame's dovetail.
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Old June 6th, 2010, 06:02 PM   #6
 
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Quote:
Originally Posted by Iowegan View Post
It's a set screw that holds the rear sight in the frame's dovetail.
thank you, I am glad I didn't unscrew it....
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