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Just received a response from Ruger. Suggested I use a couple drops blue Loctite, or return for gunsmithing. I chose Loctite. Sounds like this easy fix should work, time will tell.
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I had the same thing happen so I tapped the sight back into position by placing a rubber handled screwdriver against the sight and hitting the screwdriver gently and then I tightened the set screw.
If the sight moves again I'll use some blue locktite.
The sight felt perfectly tight, but it moved under recoil same as yours.
IMO the set screw should be a hex scew rather than a tiny ordinary screw so it could be tightened better.
I also wasn't getting the accuracy I wanted when using the original express style hunting sights so I bought an ordinary notched blade and a competition front blade from shopruger.com and I can drive tacks with it on paper now.
The original sights were excellent for outdoor plinking, but I've been shooting this pistol at paper, mostly at an indoor range.
I'd imagine the sights that came on the gun would be much better for hunting than what I'm using now.
BTW: I've been cleaning this pistol "revolver style" rather than breaking it down because I don't feel like beating on it and so far, so good.
Overall, I am very pleased with this pistol.