AR canted Barrel

What kind of front sight do you have? What is the orientation of the feed ramps in relation to the upper receiver? It may be a matter of a front sight base that is not clocked properly. Or it could be a hand guard, depending on your front sight situation.

We need more info.
Is the rifle new? If so,is it a Factory rifle or a home build?
What type of front sight do you have? Barrel mounted or Rail mounted.

Happens from time to time. Most common cause is the front sight base is off. This could be also the easiest to fix. How is your front sight mounted?

Another cause might be that the notch in the upper that the barrel extension pin rides in is off. This may or may not be an easy fix. Loosen the barrel nut and see if there is any left to right play.

Bill50 said:

The only problem is that I need to take my rear sight almost completely to the left.

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I see a distinction between less than half way and "almost completely"

Where you're at, I would leave it alone. Clocking a FSB is not an easy thing to do.

I've got a carbine upper that is the same way. Front sight base is just barely visibly canted. I'd rather have it straight but considering the rifle's purpose, it should be quite good enough.

Could be several things, have another AR? Swap an optic that has been sighted in on another and see how close it is.

Or get an optic and sight it in, if you have to screw it way left to hit POA, then it’s not the front sight that is messed up.

I have fixed a few off FSB's before. Its not all that hard, but it its not all that easy. It can be done if it bothers you enough to be worth it, but for where your at now, I wouldn't bother.

what type of front sight is it? If this is a factory rifle, or upper, any good company should fix it for you.

The OP hasn’t given us enough information to give any solid advice. If this is a rifle with a free-float handguard it could easily be that the handguard is slightly off center. Which is completely normal and not a big deal. I’ve seen rear sights that were adjusted farther to the side than that and the rifle shot just fine.

But until he comes back and tells us more about his rifle’s setup, we can’t know which advice is applicable to this situation.

Bill50 said:

I tried to zero in my AR15 again at 50 yards. I finally got it on paper with groups in a couple inches.

The only problem is that I need to take my rear sight almost completely to the left.

The attached picture is shooting about 2 inches right at 50 yards. I googled.it and this should be a canted Barrel.

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Do you have a photo of the rear sight with the rifle zeroed for 50 or 100 yards?

My PSA upper is the same way, but not as far as yours. It bugs the daylights out of my anal retentive self, but pracical me says the rifle shoots straight. For what I gave for the upper I am satisfied with it. If it was a high end build or I did it myself I would be really upset.

You either have a gas block or a barrel extension that is out of whack.

Leave it be. as Mach IV, resetting it is not easy, and not necessary, since your rear sight is not all the way to the left.

I’ve seen low-cost rear sights, especially on airsoft quality carrying handles, cause the same symptoms.

FL-NC said:

You either have a gas block or a barrel extension that is out of whack.

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Not necessarily. We don’t know if he even has an A2 front sight gas block. It could just be a slightly crooked free-floated handguard. And we won’t know until the OP comes back and gives us enough information.

I recommend forgetting about it.

That picture sucks. Lay your rifle on the kitchen counter and take a close up of the front site base/gas block.

Then get back here to us.

Bill50 said:

View attachment 781832

This was the best lighted one I could do with a cell phone. It shot about 3 inches right with this setup

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Bill50, please see posts numbers 2, 3, 10, and 16. Again, we can’t help you until you tell us (or show us) what kind of front sight you have. Is it a classic A2 gas block/front sight, or is it a front sight mounted on a free-float handguard?

OK, so that last picture rules out a slightly crooked free-float handguard. That might have been easy to fix. Now that we finally know what kind of setup you have, I think you most likely have a slightly canted front sight.

But it’s obviously not canted enough to affect gas flow (the front sight is also the gas block). It’s also not canted so much that your rear sight is cranked all the way to one side, it’s just more off-center than usual.

So as long as there’s enough windage adjustment to zero the rifle, it’s not actually affecting anything. And since the fix would be a huge pain or cost a lot of money at a gunsmith, I wouldn’t work about it. Just shoot the rifle and enjoy it. As long as the rifle works and you can zero it, you’ll be fine.