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Zeroing My SR-556

11K views 25 replies 9 participants last post by  darthcarloos 
#1 ·
Hello I recently purchased a SR-556 with the Troy Flip up sights.

At 25 Yards I cannot get it to shoot low enough for my liking. I would like to be at about an 1" 1/3 under point of aim. I am shooting approx 4 to 5 inches high at 25 yards.

The sights are maxed out and shooting as low as possible but centered. They are also in the position on the rail how they came from the factory.

I have been told by a Marine friend that perhaps by moving the front or rear sights forward or backward that I may be able to get the rifle to shoot where I want it to.

With the issues of obtaining ammo easily and the cost I would like to get this accomplished as quickly and with as few shots as possible.

I would appreciate you opinions on what to move and either forward or backward so I can adjust my sights to better suit my needs.

Any other zeroing tips for the SR-556 with the Troy flip sights would be greatly appreciated. Thanks for you help in this matter.
 
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#2 ·
Correct me if I am wrong, I thing you are saying that the POI is 4 to 5 inches above the POA. Not sure which way your sights are maxed out so forgive me if this is redundant, but to lower the POI the front sight needs to be raised.

ZEROING PROCEDURES
1. Fire a group and measure from the point of aim to the point of impact.
2. Adjust the front sight for elevation only. Adjustments can be made with an AR-15
front sight tool, AK74/47 tool, or needle nose pliers.
3. Confirm zero with a group of aimed shots.
ADJUSTMENT
1. To move the bullet impact up – turn sight blade to the right/clockwise.
2. To move the bullet impact down – turn the sight blade to the left/counter clockwise.
1/8 Turn / 45 Deg = 1” shift at 100m 1/4" shift at 25m
1/4 Turn / 90 Deg = 2” shift at 100m 1/2" shift at 25m
1/2 Turn /180 Deg = 4” shift at 100m 1” shift at 25m
1 Turn /360 Deg = 8” shift at 100m 2” shift at 25m

Hope this helps.
 
#4 ·
1. To move the bullet impact up – turn sight blade to the right/clockwise.
2. To move the bullet impact down – turn the sight blade to the left/counter clockwise.

Is this opposite of most other methods? I assume like most screws righty tighty so turning right would tighten the front post therefore lowering it?

Is that different in AR's

I mentioned this at the range to the range guy helping me as I have read it and he did not confirm it
I assumed loosing it turning left would raise it?

Is the sights threaded opposite of most things?

Thanks in advance.

That would sure make it a simple fix if it is that way.
 
#3 ·
Everything you have said is correct.

I am pretty familiar with sighting in weapons other THAN AR's so no disrespect is intended.

What I am trying to say is the way I am accustomed to there is no more way to lower the point of impact because the front post is all the way up.

With any other type of firearm I have had you always move the sight towards the point of impact and I cannot raise it any further. So it still shoots high.

Please tell me if I am not making sense. I am getting old 43 :)
 
#9 ·
Well I don't think it would make a difference but just for reference on my 556FB. My front edge of my front sight is about 1.5" from where the gas regulator inserts. The back edge of my rear sight is about 1" from the charging handle. That's how the rifle came from factory.

How were you shooting the rifle (i.e. rest, sand bags, bipod, free-standing, etc.)?
 
#11 ·
My first outing I used the gun range's rest which was a block of plastic/resin. The rifle would bounce on that rest and I would end up shooting high. I never used their rest after that. I now either shoot from the bipod or unsupported.

You can invest in a laser bore sight to help get things roughly dialed in without having to go through that hard to find/afford .223/5.56 ammo.
 
#24 · (Edited)
Glad to hear it! What rds were you running? The reason I ask.....I zeroed my FBs BUIS@ 25M with LC XM193....moved the target to 50yds to sight my Burris AR-332, again with the Lake City...was a joy...dead on...ready to wrap it up, decided to run another 20 rd mag of PMC xtac XP193 and was startled to see I had a great 1 1/2" group...but all 2" high and right....should have loaded another mag of LC to check, but wrote it off as a difference in ammo ....now I can't wait to go back and check...
Has anyone seen that big a difference between ammos?
 
#19 ·
Can you elaborate? Loose on the rail? Loose flip up? If it is loose on the rail use an Allen Wrench to tighten it back down! You should have a small tool kit or a MUT with you that has the correct Allen Wrench.
 
#22 ·
Me was the problem with the sights :)

I took the advice of those that did not know at the 25 yard range and I had not read how to adjust the front sight post correctly.

Before I left the last range with my defensive rounds I hit 3 bulls at 50 yards. I was happy.

Now I have an excuse to go back :)
 
#25 ·
Saw a video on youtube where a shooter shows how to adjust the sights, front and rear and does it in an easy way to understand. Shows a front site tool and used just the tip of a bullet to adjust the rear site. I am pretty sure the sites were Troy made but maybe you can adapt his instructions on how to zero in your sights. Thanks all.
 
#26 · (Edited)
Here are my suggestions (read you got it figured out after I typed it up lol, I'll put in my two cents anyways)

1 - If you are shooting way high at 25 yards that means your front sight post has been set to low (you went counter clock wise too far).
2 - Turn the front post clockwise (UP) and make a BIG adjustment like 10-12 clicks and see where that puts you on paper. Keep making big adjustments until you start hitting the target then fine tune with 2-3 clicks.
3 - If you can Zero it at 50 yards (36 yards and below is where you will start seeing the effects of height over bore) it might be easier to zero your rifle.

I like the 36y/300y confirm Marine Corps BZO but I don't have a 300y to confirm, so I'm did the 50 yard. I think I might change it to the 100 yard though...

Here is an excellent video about zero's from Travis Haley's Adaptive Carbine
Travis Haley Ch7 - YouTube
 
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