I've got a new SR-556, which I've put about 350 rounds through. I've zeroed the iron sights using at 25 meters using the standard M16A2 8.5 X 11 target.
Haven't shot much with it over 50 yards at this point, but have a concern regarding the rear peep sight. I can drill the center of the target easily at 25M, but noticed that the rear aperture is about 3/4 of the way over from the left, in order to get this zero.
For you SR-556 owners, is this typical for zeroing this weapon?
Whew. that's a relief. I was concerned I'd have to send it back to ruger to a 'crinked barrel'. or at least that's how I'd describe it and then let them figure it out. =)
Do you have any issues with right drift with the iron sights as the range increases beyond where you've zeroed it?
It's the rails. It's not truly a mono rail and sometimes each piece is not directly inline. My hand guard rail sits a little to the left of my flat top. And then the piston gas block rail sits even a little further left. So my rear sight needs to be way to left.
@ermica59069: if you shoot beyond the distance at which your sights are zeroed, does the shot skew in one or the other direction, based on the rear sight's offset?
No. Once the sights are aligned with the barrel, and therefore bullet trajectory, you shouldn't have to mess with them anymore unless you are dealing with wind condition or are shooting at such long ranges that the spin of the bullet causes it to crawl off target. The only thing you should really need to adjust is elevation for different distances.
Awesome. thanks guys. I just bought an eotech 512, brought up the iron sights, and aligned the red dot in co-witness witht he ironsights. I have yet to shoot it. Buddy of mine recommends zeroing to 50M. going to do that next to both sights. Appreciate the comments.
My rear sight needed a pretty good shift to the right to get it centered. It now is co-witnessed with my Eotech 512 so if the 512 fails for some reason, up go the iron sights and I'm back in business. As long as they line up.
I have zeroed it at 25 yards so it will be nearly dead on at 200 yards with XM193.
On the M1 all you need to do is loosen the big hex screw in the front sight base and move the front sight to get your mechanical zero to line up with your true zero. I mark my front sight with nail polish to index it to the base- murphy will cause the front sight to go loose when you really don't want it to!
For the SR556 having the windage off a bit isn't a big deal- you lose some windage adjustment which you would only use to shoot over 500 yards on a windy day, but likely this will never be an issue.
The 556 really is iffy at 500 yards in even the best conditions and with 68 gr bullets, so I wouldn't worry too much about the windage setting on the iron sights. Besides, you will probably use a scope at that range anyway, which negates the rail problems anyway.
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