.22 Mk 3 Target - rear sight walking

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Mk3-2020

Bearcat
Joined
Apr 1, 2024
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Folks, I am seeing the factory rear sight of my MK3 walking in the dovetail. I drifted it back to a centered point once. After about 150 rounds through the gun the rear sight has again moved to the right. I have attached a photo of the situation.

As I am not a machinist, how is this movement prevented/stopped?

Thanks in advance.
 
Joined
Dec 1, 2007
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2,935
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You could remove the rear sight, put it in a vise, and dimple the bottom of the sight with a small center punch and a wee little hammer, then tap it back into the dovetail.

But-I might first try a drop of loc-tite in the dovetail before moving the sight back where it needs to be. Might work, and a lot less trouble, maybe.
 

Mk3-2020

Bearcat
Joined
Apr 1, 2024
Messages
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Location
SE PA
You could remove the rear sight, put it in a vise, and dimple the bottom of the sight with a small center punch and a wee little hammer, then tap it back into the dovetail.
Understand where you are coming from. I'll have to investigate Loc-tite grade properties, as again, this is out of my field.
Thx
 

Johnnu2

Hunter
Joined
Jun 26, 2003
Messages
3,102
Location
NYS
Folks, I am seeing the factory rear sight of my MK3 walking in the dovetail. I drifted it back to a centered point once. After about 150 rounds through the gun the rear sight has again moved to the right. I have attached a photo of the situation.

As I am not a machinist, how is this movement prevented/stopped?

Thanks in advance.
Assuming that there is no set-screw (?) to hold it in place, I've stopped sights that are 'dove-tailed' in place by simply stuffing/wedging a thin piece of (any kind of) metal under the sight and gently banging the sight back in place. If you have an old feeler-guage, you could cut a piece (of the perfect thickness) and use it as a wedge.
J.
 

Rich/KY

Bearcat
Joined
Dec 1, 2023
Messages
21
Location
Corbin, KY
The Numrich schematic for the MK III shows a set screw for the rear sight base. Might require a bit of disassembly to access it.
 
Joined
Jan 26, 2008
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north carolina
My mark 3 has a set screw.
20240405_062257.jpg
 
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Dec 2, 2017
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BEFORE you apply anything, the colors are there for a reason! Blue loctite is a thread locker, but removable with a reasonable amount of force using a standard hex wrench or allen wrench. Red will hold maybe 15% better, but it needs to be heated to about 350 degrees F to remove it!!
Green is a wicking solution, made to be applied to assembled parts. It is much finer/thinner as a result, and may bleed over into unwanted areas unnoticed. It is also very hard to remove once it sets. All of these set up in the absence of air, and will be firm in 1 hour. Best results are waiting 24 hours, but that is an extreme in my experience.
 

Mk3-2020

Bearcat
Joined
Apr 1, 2024
Messages
3
Location
SE PA
Folks,
Based on your suggestions over these many months the problem has been solved with the use of blue Loctite on both the dovetail and locking screw.

To me, this is solved, and something for future reference to new Ruger users.

Thanks to all.
 

RC44Mag

Buckeye
Joined
Jul 18, 2022
Messages
2,077
Location
Long Island
There's also purple loctite which is designed for very small screws, ie. screws like small set screws and scope mounting screws. Either blue or purple is your best bet as mentioned already by some in the know.
 
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