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  #1  
Old 09-12-2018, 02:57 PM
Twinson Twinson is offline
 
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Default 5 MOA left concerns

I have a new M14 receiver ( Forged ) and a heavy Krieger barrel installed by the receiver manufacturer. All other parts are USGI NOS. With front sight centered. my windage must be 5MOA left to hit center X. This seems like a problem to me. Thoughts?

Full length barrel.
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  #2  
Old 09-12-2018, 03:05 PM
4gun-drill 4gun-drill is offline
 
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Sounds like a barrel index issue to me... or at least it could be. It could also be the muzzle device. I have a Glenn Nelson Super match that is about 4 MOA right (I think) and the barrel index is spot on. Turns out the SAI FH front sight base it tilted.
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  #3  
Old 09-12-2018, 03:09 PM
Twinson Twinson is offline
 
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You mean the front sight flat is off from the spline axis?
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  #4  
Old 09-12-2018, 03:11 PM
4gun-drill 4gun-drill is offline
 
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Quote:
Originally Posted by Twinson View Post
You mean the front sight flat is off from the spline axis?
Yeah. SO if they indexed off the spline and not the front sight base that may be the issue. I have seen this on some garand gas cylinders too.

The barrel on my Nelson build is a heavy Krieger as well, you will love that barrel.
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  #5  
Old 09-12-2018, 03:18 PM
Roadkingtrax Roadkingtrax is offline
 
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You need to move your front sight to compensate. Some rifles require more than others. Roughly .008" per MOA.

Nature of the beast.
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  #6  
Old 09-12-2018, 03:27 PM
Katana Katana is offline
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what receiver?
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  #7  
Old 09-12-2018, 03:31 PM
4gun-drill 4gun-drill is offline
 
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Quote:
Originally Posted by Roadkingtrax View Post
You need to move your front sight to compensate. Some rifles require more than others. Roughly .008" per MOA.

Nature of the beast.
True. But, for me I had to adjust my front sight so far over that it really bothered me. When I looked through the rear sight, I could see that it was not aligned and I would concentrate on that and not the front sight post. If it were only off by 1 MOA or so, no big deal, but the OP states 5 MOA or .040 correction which to me is a lot. Technically speaking though, it was not considered out of spec unless the front sight overhung the edge.
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  #8  
Old 09-12-2018, 04:46 PM
Roadkingtrax Roadkingtrax is offline
 
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My McCoy M1 has a narrow gas cylinder and the sights hangs off the edge by a 1/4 of the dovetail.

It could be barrel timing, it could be the receiver. I say move it .025" and shoot it. Bet its not that far off..

The aperture shouldn't allow you to see more than the ears and post anyway. You must be really really close.

Last edited by Roadkingtrax; 09-12-2018 at 04:49 PM.
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  #9  
Old 09-12-2018, 05:18 PM
Mike in NC Mike in NC is offline
 
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You might try a different flash suppressor. I don't know how precisely those splines are milled on suppressors in general. Could be a flash suppressor that was machined a bit funny. Should be a easy swap.
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  #10  
Old 09-12-2018, 05:40 PM
Twinson Twinson is offline
 
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Thank you, I'll try the flash suppressor first.
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