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  #1  
Old 10-03-2022, 10:03 PM
SMiller SMiller is offline
 
Join Date: Nov 2009
Location: Michigan
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Default Lyman 57 RS Sight

I finally found a Lyman 57RS rear sight for my REM 521T at a reasonable price. When I went to mount it the screws that came with it were too small for the base on the rifle. They appeared to be 6-48 thread while the threading on the sight base is 8-40. Tried to use some 8-40 screws but they do not fit in the countersink and holes in the sight. Am I correct in assuming that I need a new base and did they make one with 6-48 threading?
Thanks,
SMiller
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  #2  
Old 10-04-2022, 06:00 AM
schutzen-jager schutzen-jager is offline
 
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the mounting holes on receiver are 6-48 - currently have 4 521's + four spare sight assemblies + in 6 decades of collecting + researching them i have never seen or heard of mounting holes in base being threaded ever - the holes in the base should not be threaded at all -

Last edited by schutzen-jager; 10-04-2022 at 06:02 AM. Reason: spelling
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  #3  
Old 10-04-2022, 07:27 AM
LavaTech LavaTech is offline
 
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Never be surprised by what molestations can be found on Lyman 57 bases. I recently bought a 57MS base on ePay which was obviously VERY hacked by someone, but would (and does) look and work perfectly fully populated with the remaining parts. I had to make both cheesehead screws for it, the base now requires two different lengths from aggressive buggering, and $7 worth of much too long fillister head screws from Amazon was the inexpensive route for the two screws needed.
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  #4  
Old 10-04-2022, 08:32 AM
edlmann edlmann is offline
 
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Quote:
Originally Posted by SMiller View Post
I finally found a Lyman 57RS rear sight for my REM 521T at a reasonable price. When I went to mount it the screws that came with it were too small for the base on the rifle. They appeared to be 6-48 thread while the threading on the sight base is 8-40.
The 57RS does not use a mounting base - it mounts directly to the receiver. At some point the Army removed the 57RS sights and converted these to use the Redfield 75, which does use a mounting base.
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  #5  
Old 10-04-2022, 08:45 AM
schutzen-jager schutzen-jager is offline
 
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the Lyman 57 series definitely has a mounting base separate from sight - numerous pictures of them on internet + old Lyman parts lists -

https://www.bing.com/images/search?q...1&disoverlay=1

Last edited by schutzen-jager; 10-04-2022 at 08:47 AM.
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  #6  
Old 10-04-2022, 08:08 PM
SMiller SMiller is offline
 
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Location: Michigan
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Default Problem Solved

Many thanks to schutzen-jager, Lava-Tech and edelman for your knowledge and advice. What it turned out to be is I had a 521T that had a Redfield 75 sight base installed on the receiver which was tapped 6-48. The Lyman 57RS sight I bought had the base attached and came with the correct 6-48 screws. By simply removing the R75 base and installing the L57 base and sight I was ready to go.
Thanks again,
SMiller
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  #7  
Old 10-05-2022, 08:24 AM
edlmann edlmann is offline
 
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Quote:
Originally Posted by schutzen-jager View Post
the Lyman 57 series definitely has a mounting base separate from sight - numerous pictures of them on internet + old Lyman parts lists -

https://www.bing.com/images/search?q...1&disoverlay=1
I suppose there's a picture of a kangaroo out there labeled as a Lyman 57RS base, but I am skeptical.
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  #8  
Old 10-05-2022, 11:54 AM
schutzen-jager schutzen-jager is offline
 
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Quote:
Originally Posted by edlmann View Post
I suppose there's a picture of a kangaroo out there labeled as a Lyman 57RS base, but I am skeptical.
FYI try doing some research in old Lyman catalogs , Remington parts lists , + vintage gun accessories catalogs + you will find it listed as part # Q-185 sight base - the part on smiller's 521 is actually an adapter for mount a Redfield 75 base + some Lyman MJT sights on certain receivers - that is all i will say on this subject -
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