More M1/M1A rear sight check out info from the old site

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M1A4ME
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     M1/M1A rear sight, elevation question
<< on: January 4, 2007, 09:35:28 AM >> Quote 

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Maybe this has been posted here before but I haven't run across it yet.  When I sighted my CMP M1 in at the KW SS at Ramseur I ended up 12 clicks up from bottomed out on the rear sight.  Those nice little yardage markings on the elevation knob didn't begin to line up with where the BSZ was on that rifle.  I loosened the screw in the elevation knob a few turns, grabbed the rear sight with my right hand (to keep it from moving) and then turned the elevation knob (it still clicks but won't move the sight if you loosened the screw enough and hold the sight) two clicks past the 2 (for 200 yds).  Then holding the rear sight still with your right hand tighten up the screw with the screwdriver.  You have to get the screw good and tight or it will work loose and cause you problems the next time you want to make an elevation adjustment.  Once the screw is tight enough that the elevation knob is trying to turn let go of the rear sight and grab the knob with your right hand and hold it while you finish tightening the screw.  Check your new setting to insure that it is still the correct number of clicks up from bottomed out by counting the clicks down to bottomed out and back up to your BSZ (275 yds.).  If it slipped a click one way or the other repeat the procedure.

Did I do this the right way?  Thanks.

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Son of Martha
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     Re: M1/M1A rear sight, elevation question
<< Reply #1 on: January 4, 2007, 10:41:23 AM >> Quote 

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Yep.

Also check tension, run elevation all the way up, then down two.  Push down on the aperture with your thumb.  It shouldn't slip.  If it does, tighten the right side nut a click at a time until it doesn't slip.  If you tighten a click too far it makes it really hard to adjust elevation...

SoM

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Morguns1Cam
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     Re: M1/M1A rear sight, elevation question
<< Reply #2 on: January 17, 2007, 06:07:36 PM >> Quote 

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That will work, another and maybe easier way is to sight the rifle in at 200 yds, count the clicks down until the sight bottoms out. Then loosen the screw and turn the knob down or up(which ever direction it was off) and tighten the screw. Turn the elevation up the same number of clicks you counted down and see if youre on the 200 mark and fine tune as necessary till the same number of clicks gets you on the 200 mark.
             Morguns1cam

anelon
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     Re: M1/M1A rear sight, elevation question
<< Reply #3 on: January 18, 2007, 04:50:47 PM >> Quote 

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SoM's answer is right out of the Army's FM-23-5 and it works.

There is also an excellent article by Gus Fisher on "winter maintenance" in the Winter 06 GCA Journal (www.thegca.org for member info) which goes into more detail on rear sight cleaning and maintenance. That got me going on my own rear sight problem (it was drifting, too).

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