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Checking your sight base..

This is a discussion on Checking your sight base.. within the Art Luppino forums, part of the Gun Professionals category; An issue that appears too often is the improper relationship between the rear sight base to the rear sight base platform. The platform is the ...


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Old August 24th, 2016, 09:46 AM   #1
Lifer
 
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Checking your sight base..

An issue that appears too often is the improper relationship between the rear sight base to the rear sight base platform. The platform is the flat area the base sits on.. Sight adjustments will not register properly if the platform is machined too low or if the sight base is machined to low.. That may not be clear, if one or the other described conditions exists, the base will float when the unit is assembled,, and the shooter cannot see it because the cover in the way.. That is not good and waste results..

How to check for a floating sight base..

Remove the rear sight, clean all lube off the bottom of the base and the entire platform area..
Install the base holding it in place with both knobs secured..

Lift up on the base and try to slide a thin piece of shim underneath the base... If it goes all the way to the front of the platform a better fit can be obtained by adding more shim stock until base is snug.

The sight cover is suppose to do this job, and is does on the M14/M1's, commercial parts are a different story, not always but too often

I use copper shim stock, and to check I use feeler gauges,,,. 004" usually does the job. If shims are needed try to profile them to the outline of the platform for a drop in fit..

If, and it occurs, the platform is to shallow presents a much larger issue, maybe another time.. Art..

Thanks from Tommo, Squid, IRON WORKER and 8 others

Last edited by art luppino; August 24th, 2016 at 10:11 AM.
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Old August 24th, 2016, 11:03 AM   #2
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Art,

You need to put all these hints and tips into a PDF for downloading by we who are not as knowledgeable as you are.

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Old August 24th, 2016, 11:49 AM   #3
Lifer
 
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Good ideaa

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Originally Posted by ripcord View Post
Art,

You need to put all these hints and tips into a PDF for downloading by we who are not as knowledgeable as you are.


Ripcord,

But it is all I can manage to have them posted here..
Regards,, Art...

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Old August 24th, 2016, 01:25 PM   #4
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Art,

I read your posts and learn from them. Thank you for posting, it's appreciated!

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Old August 24th, 2016, 01:41 PM   #5
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Thanks for another good M1/M14 tip, Art.

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Old August 24th, 2016, 09:57 PM   #6
Lifer
 
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would brass or stainless steel shim stock be ok? And, do you just place it there to be held by the rear sight base, or should it be glued, maybe with loctite?

Thanks for the tips, tricks, and plain old "how to" on these rifles. Much appreciated.

Mr. Luppino, thank you for the magazine cartridge counter you sent me. This will be very handy to have.

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Old August 25th, 2016, 05:53 AM   #7
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Right on time, Art. Everything you've been posting about about recently is stuff that I'm doing right now! Since I lost my zero with a new flash suppressor, I figured I'd take the rear sight apart and give it a good inspection and cleaning. I've done it before, but I've never checked anything with feeler gauges.

This is the good stuff.

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Old August 25th, 2016, 06:17 AM   #8
Lifer
 
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Now's the time

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Originally Posted by Buelligan View Post
Right on time, Art. Everything you've been posting about about recently is stuff that I'm doing right now! Since I lost my zero with a new flash suppressor, I figured I'd take the rear sight apart and give it a good inspection and cleaning. I've done it before, but I've never checked anything with feeler gauges.


This is the good stuff.

Don't forget to re-lube before assemble...Art

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Old August 27th, 2016, 08:25 PM   #9
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I finally got around to disassembling my rear sight. I was pleasantly surprised to see "H&RB9" underneath the sight base. I didn't know this part had a stamp that could identify it as USGI.

Was it common practice to have matching USGI windage and elevation knobs from SAI when they were available, or is that luck of the draw? Mine are both marked WCE.


Last edited by Buelligan; August 28th, 2016 at 01:02 PM.
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