Help!! Rear Sight socket head screws

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bhp9

Bearcat
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Jun 14, 2024
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OH
I acquired a Ruger 75th Anniversary Pistol .22 Rimfire that has an adjustable rear sight. When shooting it I noticed that the "two" very, very, small socket head screws just forward of the slotted elevation screw keep backing out no matter how tight I attempt to turn them. Before I put any loctite on these two socket head screws I would like to know what are their function. Do these two screws make it possible to disassemble the rear sight or do they have something to do with locking the elevation screw.
 

Dan in MI

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Pull one and check it, but based on your description they're the screws that tension the sight against the dovetail and should definitely be secured with thread locker.

This ^

Use blue or purple NOT red.

In very generic terms.
Purple (222) is for small machine screws - removable.
Blue (242) for large machine screws and bolts - removable
Red (262) for things you do not want to ever take apart - only removable with heat
Green (?) permanent stud and bearing mount
 

contender

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Sep 18, 2002
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Lake Lure NC USA
Another well known trick to avoid adding any liquid stuff that may be harder to remove,, is to remove the screws first. Then, insert a piece of monofilament fishing line into the hole. Then screw in the screw,,, and the tail of line,, cut off or using a lighter,, allow it to melt away to the edge of the screw head.
 

contender

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bhp9, Glad to help spread good info.

It's actually an old method used by many of us over the decades. Our beloved friend, former owner of this Forum, and Ruger fan Flatgate often shared this tip. (May he RIP.)

I keep a spool of 6# test line on my bench. When I think I need it,, I grab the line,, pull out a few rounds,, take the end, insert it in a screw hole,, add the screw,, tighten it down. Fingernail clippers get used to cut close to the screw head. Then I take a lighter,, and as you get the flame close to the line,, the line curls & melts right to the screw head.
 

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