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FH castle nut removal, sights not centered now

This is a discussion on FH castle nut removal, sights not centered now within the Gunsmithing forums, part of the M14 M1A Forum category; My friend in Orlando tells me he was removing his FH castle nut and forgot to take the set screw out. He proceded to tap ...


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Old March 16th, 2017, 04:14 PM   #1
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Question FH castle nut removal, sights not centered now

My friend in Orlando tells me he was removing his FH castle nut and forgot to take the set screw out. He proceded to tap the nut with a brass punch and hammer and broke the screw. He bought a new castle nut, screw etc and re assembled after he put on the new FH. He now says his rifle will sight in and shoots great but the rear sight is way to the right on the grid lines on the heel, the rear sight was not disturbed during the hammer session.

Is the barrel turned in the receiver? He says it looks OK and is sending me pics tomorrow.

Why would the sights be to the right ? Could the hammer force turn the barrel out of position.?

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Old March 16th, 2017, 04:45 PM   #2
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Quote:
Originally Posted by Pvt. Joker View Post
My friend in Orlando tells me he was removing his FH castle nut and forgot to take the set screw out. He proceded to tap the nut with a brass punch and hammer and broke the screw. He bought a new castle nut, screw etc and re assembled after he put on the new FH. He now says his rifle will sight in and shoots great but the rear sight is way to the right on the grid lines on the heel, the rear sight was not disturbed during the hammer session.

Is the barrel turned in the receiver? He says it looks OK and is sending me pics tomorrow.

Why would the sights be to the right ? Could the hammer force turn the barrel out of position.?
Don't let this guy ever work on your gun,car,etc!

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Old March 16th, 2017, 04:48 PM   #3
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Hello, Your friend needs to move his front sight to the left to correct this. You did say that he put on a new Flash suppressor, and the sight is on the FS. moving the front sight to the left will help him get his rear sight more to the center... Tell your friend that the front sight also has a screw that needs to be loosened.

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Old March 16th, 2017, 04:59 PM   #4
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Question

Mike is aware of all of the adjustments to sights. He says when his rifle is sighted in the fronts are in perfect alignment with the FH sight platform, equal distances on each side. The rear sight is way past center to the right in order to get on center at 100 yards, it was not this way prior to the hammering episode.

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Old March 16th, 2017, 05:02 PM   #5
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Most m14 rifles that match shooters use the front sight is shifted off center so the rear can be centered.

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Old March 16th, 2017, 05:09 PM   #6
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He can try putting a level across the heel of the receiver, and compare it to a level across the doohickie that the front sight sits in (with the sight removed), and see if they're no longer level.

I wouldn't expect something like that to rotate a barrel, if the barrel wasn't all that tight in the receiver... but he can at least verify.

if the suppressor/brake doohickie that the castle nut addresses has a lot of slop as far as how it fits with the splines, or whatever you call them, that itself could cause a little bit of rotation, but it wouldn't be too extreme, I'd think.

Dunno. Be interested in what you find out.

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Old March 16th, 2017, 05:20 PM   #7
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Quote:
Originally Posted by Wasted ammo View Post
Most m14 rifles that match shooters use the front sight is shifted off center so the rear can be centered.
10-4 on that. Mine is a bit to the right and is one click in the rear to the right off center for my 100 yard center X and 7 clicks up from bottom.

I thought the same as muppetmeat4me as it seemed it would take a bit more than a small hammer and brass punch to jack a barrel loose. I'll post as I get info from him. I think he's overthinking this or looking at it wrong or ????


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Old March 16th, 2017, 06:04 PM   #8
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Flash hiders are not created equal. There is a lot of variations from one to the next, not just in the way they are made, but in the way they align on the barrel. It is not a perfect system, hence the adjustment allowance with the front sight.

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Old March 16th, 2017, 09:08 PM   #9
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OK, he was hitting the castle nut that was still locked into the FH with the set screw. Does anyone think that maybe the force of the punch was getting transferred to the FH? Like maybe the internal splines of the FH got peened? So now the FH is misaligned, and the front sight is visibly off center?

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Old March 17th, 2017, 03:30 AM   #10
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Originally Posted by smoothy8500 View Post
OK, he was hitting the castle nut that was still locked into the FH with the set screw. Does anyone think that maybe the force of the punch was getting transferred to the FH? Like maybe the internal splines of the FH got peened? So now the FH is misaligned, and the front sight is visibly off center?
That would be a logical assumption.

That, and there is some play in the splines, so just removing and re-installing (correctly) can make a small difference in where the front sight needs to be....

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Old March 17th, 2017, 05:00 AM   #11
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Quote:
Originally Posted by Pvt. Joker View Post
He bought a new castle nut, screw etc and re assembled after he put on the new FH.
As I understand the original post, it is a new FH. That alone can make a difference.

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Old March 17th, 2017, 07:47 AM   #12
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He is in Orlando you say?
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Old March 17th, 2017, 07:51 AM   #13
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Wow, Thanks for the info. Happy Shooting maybe

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Old March 17th, 2017, 08:18 AM   #14
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As I understand the original post, it is a new FH. That alone can make a difference.
I re-read his post and initially missed that tidbit of info. So yes, new FS zero needed.

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Old March 18th, 2017, 05:34 AM   #15
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From new guy ,good question thanks for posting ,honerable mentions to kurtC ,lysander ,andsmoothy8500 for schooling us thanks guys oops left out bolt action ,wasted ammo and muppetmeat in honerable mention .


Last edited by M14wannabe; March 18th, 2017 at 05:37 AM. Reason: Left out important Information
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