.22 Mk 3 Target - rear sight walking

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Mk3-2020

Bearcat
Joined
Apr 1, 2024
Messages
2
Location
SE PA
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
Messages
2,755
Location
Texas
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
2
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
2,918
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
13
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
Messages
795
Location
north carolina
My mark 3 has a set screw.
20240405_062257.jpg
 
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