Iron Sights Issue

gnmontey

gnmontey

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This is how much I had to move my front sight with the rear sight centered in order to attain a laser bore alignment. How are you supposed to deal with this? Is this an indexing issue?

sight.jpg
 
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Are you sure the boresighter fitted perfectly in the center of the flashhider ?

Your sight base doesn't seem to be flat and your sight seems to be canted on the right, maybe a bad picture... But if it is that might be one your problem. If it is, ditch and replace parts accordingly or/and scope your rifle.

Indexing might be an issue, but if your sight/base are no good, you'll need to use another method to see if there is some serious indexing issue, try using straight object in the gas port and look if it is centered with the receiver.
 
My impression is that the whole front sight assembly (including flash hider) is canted to the right. Which jives with having to boot the sight to the left.

I can't vouch for the accuracy of the muzzle style laser bore sigher alignment. It has worked well in the past.

I don't follow this part "try using straight object in the gas port and look if it is centered with the receiver."? Need a picture.
 
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This is one of the realities of the norcs. Both of my barres are not correctly indexed, but nowhere near what yours is. My front sight was maybe 2mm over the edge max on the one rifle, the other was just a hair.

Find someone local whos got a barrel/receiver wrench and a strong vice and re-index it.
 
gnmontey said:
I don't follow this part "try using straight object in the gas port and look if it is centered with the receiver."? Need a picture.
Click to expand...

Well, flip the barreled-action over and use something like a drill bit or a hex key and put it in the gas port (be gentle) now see it points at 12 o'clock, your barrel isn't indexed properly.
 
if it is a norinco, some of the sight bases on the flash suppresers were milled on a wrong angle, or off to the right or left. easy fix. get a new gi flash suppreser.
 
The bore sighter worked well for setting up a scope on my m305. I assumed it should work for iron sights?

I put a drill bit through the gas port into the barrel. That alignment appeared to be ok.

I have a USGI Flash hider ready to go, but have not been able to remove the Norc hider. I can't find the tack welds to drill out.

I'm attending the SG Clinic in Nov, so I think I will leave things be for now and wait for some guidance.

Plan to shoot irons only this weekend. Will let you know if the bore sighter was telling the truth.
 
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I never made it to the range the weekend of the 10th. A hot water heater problem and new storm door got in the way. The weekend of the 18th was consumed by a pheasant hunt. I did however manage to hit the range today (Cold and windy, but suitable for chrony and short range iron sights work).

Since my last post I managed to replace the Norc flash hider with a USGI unit. After replacing the hider, I found that my muzzle style laser bore sighter would not work at all (USGI flash hider bore diameter is significantly smaller, hence the mandril would not reach the crown of the barrel). About the time that I replaced the hider, my Cabela's chamber style laser bore sigher arrived. The chamber style bore sighter indicated that I needed to center both rear and front sights to obtain alignment.

At the range, with both sights centered, 50yd shots were 5 inches left. Two rear sight line increments (pretty significant) were required to center shots at 50yds. The whole front sight platform still appears canted to the right (to me), so I'm thinking there may still be an indexing issue going on here.
 
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from what i've read here, I would agree with the indexing issue. The usgi flashider will generally fix the problem of a misaligned front sight..... if it doesn't...... indexing is the next culprit. I have not yet seen a norc barrel that has misaligned flash hider splines..... so again..... indexing might be in order. The edmonton clinic is not far away.... easily addressed while yer there.
 
Further development:

I re-installed the Norc flash hider so that I could compare the muzzle v.s. chamber style laser bore sighters. There were significant discrepancies between the two!

Once I re-scope (next week with luck), I'll take the flash hider off and compare both sighters on even ground. Will post my findings.
 
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With the flash hider removed both the chamber style and muzzle style laser sighters produced pretty much the same result.

Both sighters are Cabela's brand. Don't bother with the Bushnell muzzle sighter, it's a piece of junk compared to Cabela's product.
 
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