Adjusting/Replacing the Front Sight on M1 w/ range rpt - M14 Forum

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Adjusting/Replacing the Front Sight on M1 w/ range rpt

This is a discussion on Adjusting/Replacing the Front Sight on M1 w/ range rpt within the M1 Garand Accuracy forums, part of the Rifle Forum category; I have a CMP Special M1, 30-06. I want to adjust the front sight more to the middle of where it sits on the gas ...


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Old November 1st, 2016, 08:37 AM   #1
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Adjusting/Replacing the Front Sight on M1 w/ range rpt

I have a CMP Special M1, 30-06. I want to adjust the front sight more to the middle of where it sits on the gas cylinder. As it turns out if I move to the middle more I will reduce the number of right clicks of windage so that when I work out to 600 yds I'll have a shorter amount of clicks, etc. along the way.

I potentially want to replace it with a new one with a nice sharp blade on it if I get the original one moving to begin with. Currently when loosening the lock screw it is still very tight, not loose enough to push via my finger.

I just left it alone as I had a match to sight in for just after I got it but now I'd like to make a couple adjustments.

Can someone recommend if there are specific tools made for this or a good technique I could use where I won't feel like I'm bashing up a nice rifle tapping on it?

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Last edited by brianns; November 19th, 2016 at 03:46 PM.
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Old November 1st, 2016, 08:46 AM   #2
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Remove the setscrew; spray with some oil/penetrating oil and allow it to penetrate. Tap fairly gently from left-to-right with a plastic mallet. If it won't move, something is wrong and it needs closer examination.

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Old November 1st, 2016, 09:34 AM   #3
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Remove the setscrew, spray with a good penetrating oil and let it sit at least overnight - 24 hours is better. Tap GENTLY to move it. Remember however, the front sight was moved there for a reason. You may have to move it back - assuming the same sight.

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Last edited by ripcord; November 1st, 2016 at 09:35 AM. Reason: Typo..Duh!
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Old November 1st, 2016, 09:38 AM   #4
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For most, punch it out from left to right seems to work best. Not scientific, just an old wife's tale...

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Old November 1st, 2016, 10:11 AM   #5
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Put a witness mark on the base to make alignment of the new sight easier.

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Old November 1st, 2016, 10:35 AM   #6
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front sight movement

In theory, .004" of front sight movement equals 1 inch at 100 yards.. Works for most of us.... Art

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Old November 1st, 2016, 11:03 AM   #7
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It'll move with very little tapping. I think a little snug is a good thing. As far as centering the front sight, aesthetics only. I center my rear sight- bring to zero with front sight. Probably gonna move a click or two L or R depending on range, conditions, etc. but I've got a white mark on rear sight for old eyes to alert me to where I left it last. Don't hurt to keep a few notes (especially for 600) to keep from wasting sighters. Much less stress if first sighter is pretty close.

PS if you're running out of windage at 600, assuming all is reasonably centered, then you gonna be experiencing a day when most riflemen have long since left the range...if you look down the line and see a couple guys still shooting, introduce yourself when they're done. It'll shorten your learning curve.

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Old November 1st, 2016, 06:55 PM   #8
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Quote:
Originally Posted by alta fuego View Post
I center my rear sight- bring to zero with front sight. Probably gonna move a click or two L or R depending on range, conditions, etc. but I've got a white mark on rear sight for old eyes to alert me to where I left it last. Don't hurt to keep a few notes (especially for 600) to keep from wasting sighters. Much less stress if first sighter is pretty close.
That's what I will do, just like with my M1A, when I get the thing off. I think I'll just get the new part for a crisp blade. Well I hope centering the new one won't need too much adjustment since it looks like moving the current one to center might have been about the .004 or so needed to reduce some windage clicks. But it will be a do over. I can take some measurements in case I need to go back.

Anyone have thoughts on getting just a NM front blade without going to a smaller rear peep? That's what I'm thinking for the replacement given the opportunity.

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Old November 1st, 2016, 08:16 PM   #9
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The slot on both sides is for a tapered wedge like a small flat blade screw driver if it doesn't move by hand.
I took a small flat file and ground off one side (narrow side). I filed the sides of the sight blades narrower. I kept the slight taper from front to rear. The flat side ground was to keep the base top from being filed down. Heated the ears to spread them wider for a better sight picture (like a WRA or IHC)
I reparkerized them or you can paint them flat black.
I've done this to M14 front sights too.

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Old November 1st, 2016, 08:29 PM   #10
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Quote:
Originally Posted by brianns View Post

Anyone have thoughts on getting just a NM front blade without going to a smaller rear peep?
If you have "middle aged" eyes, I believe that the front sight being thinner is harder to see without corrective lenses and a smaller aperture. I chose to use Art's modified rear aperture from Shootingsight and corrective +.50 lense with NM front sight. Very effective for me at the 600yd line. 200 and 300 didn't need it as much.

For most middle aged shooters, a standard front sight is a little easier to focus on with a standard rear aperture.

Art's rear aperture is still qualified to use in "as issued" Garands.

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Old November 1st, 2016, 10:31 PM   #11
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Ta da. Got the M1 out to get some liquid wrench on it. Then one thing led to another. I didn't measure anything like I thought I might. It came off fairly easily; with light tapping. Probably had 20-30 min of soaking time. The set screw turned OK but it had some rust on the threads The other surfaces of the dovetail were pretty smooth.
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Old November 19th, 2016, 03:36 PM   #12
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Here's the follow up range report. The left paper target is sight in at 100yds. The shootnc targets(17in dia) are at 200yds. I was shooting 150g prvi partisan 'for M1' 30-06. At the end of the day I was hitting on the red center. My rear sight was 2 clicks right windage, 7 up elevation for 200yds. That was about where I was with sight I replaced. The right paper target was a few shots taken with 200 yd setting before leaving. This was all from sand bags on a bench. The new criterion barrel it came with seems very capable of tight groups.

My calipers couldn't fit on a good place to measure on the front so I just moved the front sight once by eye before finishing at the rear sight. I bought a standard width front sight. It seems so wide but its ok. It's nice and square.

Now I need to get it on the 300 and 600 yd berms and carry on.

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Old November 19th, 2016, 04:14 PM   #13
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When moving the front sight of standard M1, 0.008 inch will give about 1 inch of POI movement at 100 yards.
(e.g. with a 36 inch (1 yard) sight radius, 0.01 inch sight movement will give 1 inch POI movement at 100 yards).

And yes, put scratch witness marks on the base and sight to see how much it has been moved.

The windage no-wind-zero will likely be different depending on shooting position. So just pick one, and keep good notes about what the 'zero' setting is for other positions and distances.
I write-down my sight settings based on the 'mechanical zero' hash marks - it's fairly easy to see, and put some white paint at 12 o'clock on the windage knob as an aid.

Jay Kosta
Endwell NY USA

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Old November 20th, 2016, 05:27 AM   #14
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Quote:
Originally Posted by brianns View Post
Here's the follow up range report. The left paper target is sight in at 100yds. The shootnc targets(17in dia) are at 200yds. I was shooting 150g prvi partisan 'for M1' 30-06. At the end of the day I was hitting on the red center. My rear sight was 2 clicks right windage, 7 up elevation for 200yds. That was about where I was with sight I replaced. The right paper target was a few shots taken with 200 yd setting before leaving. This was all from sand bags on a bench. The new criterion barrel it came with seems very capable of tight groups.

My calipers couldn't fit on a good place to measure on the front so I just moved the front sight once by eye before finishing at the rear sight. I bought a standard width front sight. It seems so wide but its ok. It's nice and square.
Now I need to get it on the 300 and 600 yd berms and carry on.
Looks real good. Those Criterion barrels are nice shooters too. There's one on my 7.62/.308 HRA Special which I bought when CMP offered them about 4 years ago during the Nat'l Matches at Perry. Probably my best shooting M1.

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Old November 20th, 2016, 08:15 PM   #15
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I would use a pencil too mark the sight as it will clean off. After you found the sweet spot you can use some fingernail polish as a witness marker.

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