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Ruger Mark III rear sight problem

This is a discussion on Ruger Mark III rear sight problem within the Ruger Rimfires forums, part of the Pistol & Revolver Forum category; I purchased a new Ruger Mark III Hunter this week and finally got it out in the yard this evening. It's a fun [anything but] ...


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Old August 3rd, 2010, 06:12 PM   #1
 
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Ruger Mark III rear sight problem

I purchased a new Ruger Mark III Hunter this week and finally got it out in the yard this evening. It's a fun [anything but] little gun. There is a problem with it though. The adjustable rear sight has bottomed out and the gun is still putting it's groups about 2 inches high at 20 yds. Any suggestions? Like I said, the gun is brand new out of the box, but I bought it from Bud's Gun Shop, so it's not like I can just walk it back into the shop. Thanks.



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Old August 3rd, 2010, 06:49 PM   #2
 
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Now, don't take offense, because i do not know your skill level.

You might want to check your sight picture. Perhaps the way you are lining up the front and rear sights is not typical.
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Old August 3rd, 2010, 07:01 PM   #3
 
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No offense taken.

I have the full circle of the front sight nestled completely into the notch of the rear sight without any of it covered by the rear sight. Pretty much as described in the owner's manual, I even checked to make sure I wasn't doing something stupid.

I wish it was that easy...
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Old August 4th, 2010, 03:47 AM   #4
 
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Well, ok. Here's another nearly as insulting suggestion.

I'm looking at the Owner's Manual. On the exploded view, page 40, they show part 12 as the set screw and part 16 as the elevation screw. They have these two mixed up in the picture. Actually, it's part 12 on the schematic that is the elevation screw. But I doubt that's it.

The only thing I can think of (I'm looking at mine right now) is there is a piece of shaving or something under the rear sight assembly keeping it from going all the way down or perhaps the blade part of the assembly (part 13) isn't seated correctly.

The only other thing I can think of is that perhaps you are pulling it a bit when you shoot or your gripping style causes it to move up when you pull the trigger.

I've heard that if you "sandbag" a pistol or revolver it can shoot off the point of aim (not sure if that's true with small calibers), but you might try sandbagging your shooting hand wrist to steady yourself to double check your technique. Slow gentle pull on the trigger until it "breaks".

It may also be the ammo you're using. I know some ammos shoot to different points of aim, although I doubt that's it. Keep in mind the Ruger Mark III is designed for standard and high velocity ammo. It is NOT designed for hyper velocity ammo, though i doubt it would throw it off that much.

I'm really guessing it's something very simple. All being said, let me know what it turns out to be. Mine is on the bench right now, ready for a disassembly, so if you need to know what something looks like disassembled, let me know.
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Old August 7th, 2010, 05:17 PM   #5
 
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if you cannot raise the front sight, cut the notch lower ( with a small Swiss file) or remove material from the bottom of the rear sight...BUT before you do this, I'd have someone else "try" and see what their groups are ........the other thing is what is your "hold) you describe the "sight picture" but where are you holding on the target ?? try a 6 o'clock hold.... try different ammo and hold before doing ANYTHING to the gun..........
Good luck
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Old August 19th, 2010, 07:36 AM   #6
 
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Also a new Mark III owner

I also just purchased a Ruger Mark III, and I have a similar problem with the rear sight. Specifically, because of my eyesight and unsteadiness, I have a hard time putting the front sight consistently in alignment with the V-notch. I would like to replace the rear sight with an optic fiber sight, which seems to work better for me with other guns, but I don't know what to look for in order to ensure the same height for the new rear sight and the front sight. Any advice would be appreciated.

Fred

Last edited by fmbaseball; August 19th, 2010 at 07:37 AM. Reason: just adding my name
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Old August 19th, 2010, 08:48 AM   #7
 
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I also have a Mark III hunter that came with the hi-viz front and "V" notch rear. I too did not like the sight picture and couldn't hit a barn from the inside. I called Ruger and got the target (Partridge square) front sight and the Partridge (square) rear sight blade and installed it quite easily. Problem solved.

Quite easy to do, too, although it took me a few minutes to get the rear blade in. The secret is to have a toothpick or something like that to push in and hold the spring while you seat the blade in there then put the adustment screw back in.

Last edited by Tater; August 19th, 2010 at 01:39 PM. Reason: grammatical and syntax errors
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Old August 19th, 2010, 02:13 PM   #8
 
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A gun I have with a Patridge sight is not suitable when the target is dark, for my eyes cannot resolve the target from the edges of the sight. That's why I'm so interested in the optic fiber rear sight.

Fred

P.S. I REALLY like your Thompson quote!
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