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9/22/2017 12:11:25 AM
Posted: 2/22/2009 5:44:53 PM EDT
[Last Edit: 5/12/2010 7:39:27 PM EDT by sgtlmj]
With all the new variants and optics with different spacing systems, it is a bit confusing as to how high one should mount their sights and/or optics, so this thread will detail the heights of the rails and optics of the different AUG variants.

For rails, measurement is to/from the top of the rail surface––For optics and sights, measurement is to the approximate center. That way it won't matter which rifle you have.

As a baseline we'll also show standard AR-15 measurements, which is what most of the sights and optics out there are being designed for.

Help me fill in the blanks. Dial calipers or better should be used. Pics are nice if you want to get fancy.

Pick your rail height (comb to top of rail) from the first list, then look at the sights or optics list (rail to center) and add them together to determine total height from the comb.

Comb to top of rail height:

AR-15: 0.530

AXR: 0.765

STG556: 0.960

XM17E4: 0.700

Promoted Pawn: 0.688

2020's TR-35: 0.700

AUG A2: ____

AUG USA A3 Standard: 0.590

AUG USA A3 High: 0.905 (Rare. Designed to be used with Steyr 1.5x optik)

AUG SR: 1.110


Comb to optic center height:

AR-15: 1.930 (Center of M68 CCO as a baseline)

AUG A1: 1.85

AUG A2: 1.90

AUG Jagdkommando:____

STG556 1.5x Low: 1.60

STG556 1.5x High: 1.85


Optics (measured from top of rail to center):

Aimpoint (M68 CCO) w/ OEM mount: 1.10 w/ spacer: 1.40

Aimpoint CS: 1.10

Aimpoint ML2 w/ LaRue LT152 (Low for RAS): 1.25

Aimpoint M4 & M4S: 1.20 w/o riser. 1.55 if using the riser.

Elcan Spectre RD: 1.50

Trijicon RX30-23 w/ ARMS mount: 1.625

Trijicon ACOG w/ TA51 mount:____

Leupold CQ/T: 1.64

EoTech w/ standard mount:____

Aimpoint Micro w/ OEM mount:____ low spacer____ high spacer____

Aimpoint Micro w/ LaRue: LT661: 0.875 LT660HK: 1.31 LT660: 1.64

Aimpoint Micro w/ KAC Mount: No spacer: 1.275 One spacer: 1.40 Two spacers: 1.525

Aimpoint Micro w/ GGG: 1.53


Iron Sights (measured from top of rail to center):

AR-15 BUIS: 1.40

AUG A1 Backup Irons:____

STG556 Backup Irons Low:____

STG556 Backup Irons High:____

ARMS40L: 1.42


If there's anything I missed, or something else you'd like to see, please advise.

Link Posted: 2/22/2009 7:07:19 PM EDT
[Last Edit: 6/27/2010 7:06:00 AM EDT by Tomac]
Aimpoint Micro on STG-556 using LaRue LT661 mount: .875" from top of rail to center of optic.*
Aimpoint ML3 on STG-556 using LaRue LT152 mount: 1.25" from top of rail to center of optic.**
Trijicon RX30-23 on STG-556 using ARMS mount: 1.625" from top of rail to center of optic.***

* = I find this the lowest possible practical height for the Micro, very solid cheekweld, any lower would be unusable by me.
** = This seems an excellent height w/good cheekweld but not too high.
*** = Usable but too high w/insufficient cheekweld when compared to the others.
Tomac
Link Posted: 2/22/2009 9:40:13 PM EDT
Added, thanks!

Does anyone know if there's an optic height FAQ somewhere on this vast site? I don't have time to look at the moment. Standard optic and sight heights would make this post fill up quicker.
Link Posted: 2/22/2009 11:43:43 PM EDT
[Last Edit: 2/26/2009 10:56:56 AM EDT by elundgren]
What is the distance from bore center to rail on a flat top AR and then bore center to rail on STG/AXR There are some interesting front sights that mount on the barrel (usually gas block type) that might work very well on an STG or AXR providing the rear one could be matched for height. I know you are thinking more for optical sights but for my use a set of simple light irons would sure be nice. The set up might cost as much as an aimpoint c3 though and might weigh about the same and the micro would be even lighter so maybe not but it would still be good info. EDIT 2-24-09: Bore center to rail top; AXR 1.575, STG 1 725, AR flat top 1.230
Link Posted: 2/23/2009 10:06:12 AM EDT
Link Posted: 2/24/2009 12:57:42 AM EDT
[Last Edit: 2/24/2009 1:39:31 AM EDT by gunnut003]
AR15;

comb to top of rail - 0.530"
comb to optic center height (m68 CCO absolute co-witness) - 1.930"

M68 CCO Optic top of rail to center of OEM Mount WITH OEM SPACER - 1.400"
M68 CCO Optic top of rail to center of OEM mount WITHOUT OEM SPACER - 1.100"

ALSO, the Comb to BUIS IRONsights for the AR should be ~1.90" not 1.40"
Link Posted: 2/24/2009 2:00:19 AM EDT
Originally Posted By gunnut003:
AR15;

comb to top of rail - 0.530"
comb to optic center height (m68 CCO absolute co-witness) - 1.930"

M68 CCO Optic top of rail to center of OEM Mount WITH OEM SPACER - 1.400"
M68 CCO Optic top of rail to center of OEM mount WITHOUT OEM SPACER - 1.100"

ALSO, the Comb to BUIS IRONsights for the AR should be ~1.90" not 1.40"


Thanks for the numbers. As for Irons––I meant to say from rail to center, not comb to center. Fixed it.
Link Posted: 3/2/2009 8:32:06 PM EDT
STG-556 w/Aimpoint CS: 1.2" measured from top of rail to the center of the CS's 26mm tube. Near-perfect cheekweld!
Tomac
Link Posted: 3/2/2009 9:15:42 PM EDT
Originally Posted By Tomac:
STG-556 w/Aimpoint CS: 1.2" measured from top of rail to the center of the CS's 26mm tube. Near-perfect cheekweld!
Tomac


Pics! Dammit man!
Link Posted: 3/3/2009 8:41:05 AM EDT
CS manual states 1.1" from top of rail to center of optic. My bad!
Tomac
Link Posted: 3/4/2009 12:01:52 AM EDT
Optics (measured from top of rail to center):
Leupold CQ/T: 1.64
Link Posted: 3/27/2009 9:19:33 PM EDT
A3 US Variant = .590
Link Posted: 3/27/2009 9:57:12 PM EDT
Originally Posted By BrianNH:
A3 US Variant = .590


I'm on it. I'm surprised it's that low. I superimposed the pic of my AXR over a A3, and they were pretty close. Guess my calibrated eyeball is off.

Great news though. Easier to raise sights and optics than to lower them.
Link Posted: 4/4/2009 5:58:56 PM EDT
Aimpoint M4 & M4S = 1.2" w/no riser measured from top of rail to center of optic. 1.55" if using the riser.
Tomac
Link Posted: 4/5/2009 3:14:11 PM EDT
So all this variation tells me that you can't easily use backup iron sights on the AUGs (and variants), huh?
Link Posted: 4/5/2009 4:49:53 PM EDT
Originally Posted By AggiePhil:
So all this variation tells me that you can't easily use backup iron sights on the AUGs (and variants), huh?


Not at all. Heights of optics and BUIS are the same no matter what rail you put them on. Just the initial height off the comb is different between rifles. Biggest limiting factor is if you have enough real estate on your rail to fit everything.

Link Posted: 4/5/2009 7:02:06 PM EDT
True, I guess if all the sights on one particular gun are on the same height rail, there's no problem. On the AUG though, how are you supposed to have space for an optic and backup irons?
Link Posted: 4/5/2009 8:23:42 PM EDT
Originally Posted By AggiePhil:
True, I guess if all the sights on one particular gun are on the same height rail, there's no problem. On the AUG though, how are you supposed to have space for an optic and backup irons?



If you use a small optic like the Aimpoint Micro series then it's no problem but even std-length optics like the Aimpoints will fit w/BUIS if you use either a fixed front sight or a folding front sight set to fold forward instead of back.
Tomac
Link Posted: 4/17/2009 8:19:21 AM EDT
Elcan Specter RD: 2.5" measured from top of comb to center of optic so 1.56" from top of rail to center of optic?
Tomac
Link Posted: 4/18/2009 8:28:41 PM EDT
Comb to optic center height:
AUG A1: 1.85"
Link Posted: 4/19/2009 2:22:09 AM EDT
Comb to top of rail height:
AR-15: 0.530
AUG USA A3: 0.590



so, if im reading right, the difference between the aug a3 and the ar15 is only .06''?

so basically, i could put my cantilever mounted aimpoint on an aug a3 with little problems?
Link Posted: 4/19/2009 3:26:53 PM EDT
Originally Posted By Friendly_Crusader:
Comb to top of rail height:
AR-15: 0.530
AUG USA A3: 0.590



so, if im reading right, the difference between the aug a3 and the ar15 is only .06''?

so basically, i could put my cantilever mounted aimpoint on an aug a3 with little problems?


Should work just fine. The AUG is well suited for CQB (shooting and moving, typically <50yds). When shooting a long gun (or pistol) in CQB you should bring the weapon up to your eye, rather than squash your head down on the weapon. This allows you to scan and move in a more natural manner. You want the sighting system low on a precision rifle to reduce parallax, but for CQB it's heads-up.

To find your sweet spot, stand up straight, close your eyes and shoulder your rifle. Open your eyes and see if you are looking through your sights or optic. For me, the AXR with the GGG Aimpoint Micro mount is perfect. Shooting, moving, cornering, etc.; I am able to keep my eye in-line with the optic. You won't be looking over the top of your shooting glasses that way either, which is extra important if you wear prescription glasses, like me.
Link Posted: 5/19/2009 11:00:26 PM EDT
AUG Special Receiver - Top of stock to top of Picatinny rail = 1.110"



AUG A2 - Top of stock to middle of A2 optic = 1.900"



Also, not quite sure what you are looking for when you say AUG A1 Backup Irons
Link Posted: 5/20/2009 4:23:12 AM EDT
Excellent! The back up irons on the top of the optic.
Link Posted: 5/20/2009 11:55:30 PM EDT
I'll get you the AUG A1, A2 BUIS measurement and the A2 to top of rail measurement this weekend when I get some time.
Link Posted: 6/6/2009 12:01:48 AM EDT
Anyone know the exact height difference between a standard AR rail and a standard AR railed gasblock?
Link Posted: 6/6/2009 2:05:02 AM EDT
No one has the height w/ a Eotech?
Link Posted: 6/6/2009 7:49:17 AM EDT
[Last Edit: 6/6/2009 7:49:35 AM EDT by Tomac]
Originally Posted By Col__Kurtz:
No one has the height w/ a Eotech?


1.5" measured from the top of the optics rail to the center of the HUD window on the Eotech 512.
Tomac

Link Posted: 6/8/2009 2:36:12 AM EDT
Cool, thanks Tomac!


Link Posted: 6/8/2009 8:56:07 AM EDT
Anyone know the exact height difference between a standard AR rail and a standard AR railed gasblock?
Link Posted: 8/6/2009 11:18:57 AM EDT
Originally Posted By sgtlmj:

If there's anything I missed, please advise.
Thanks for playing.




What about height over bore?
Link Posted: 12/2/2009 1:06:27 PM EDT
Anyone have a measurement on an Aimpoint T-1 with the Daniel Defense mount? It looks to be as tall as the LT660 mount that I alrerady have. I need something slightly lower. Seems like the GGG and LT 660HK are the two mounts that are a little lower than the LT660.
Link Posted: 2/6/2010 12:23:53 PM EDT
[Last Edit: 2/6/2010 12:54:16 PM EDT by G-lock]
Hopefully this is useful.

I found a post that said the rail to the center of the PA Gen 2 MicroDot mounted on an LT661 is .94, this coupled to the STG rail of .960 comes out to 1.90 which is the same as the AUG A2 optic.

Jeff
Link Posted: 2/6/2010 8:31:37 PM EDT
Is the .700" for the STG E4 rail confirmed? Still has the question mark...

Thanks.
Link Posted: 3/8/2010 2:39:25 PM EDT
You have AR15 comb to top of rail height as .530. Is M4 height different? What about HK MR556 ARtype?
Link Posted: 3/11/2010 5:31:50 PM EDT
[Last Edit: 3/21/2010 12:34:24 PM EDT by boricua9mm]
I just installed a Promoted Pawn optic rail and the height from the top of the stock to the top of the rail measures as follows:

22/32 inches, or 0.6875 inches.

One thing that might cause some variation with pepole measuring is the plastic flashing (seam) leftover from the joining of the two stock halves. Mine is trimmed down to the actual level of the stock. If someone has left that seam/flashing in place, it will lower the measured height of the rail, as you'd be measuring from a higher point on the stock .


Link Posted: 3/20/2010 1:31:04 AM EDT
This is the rail height you list.

XM17E4: 0.700

AUG USA A3: 0.590


It seems to me that visually, the A3 rail height is taller than the E4 rail height. Am I wrong?
Link Posted: 4/5/2010 8:27:19 AM EDT

Originally Posted By BOBno1:
This is the rail height you list.

XM17E4: 0.700

AUG USA A3: 0.590


It seems to me that visually, the A3 rail height is taller than the E4 rail height. Am I wrong?
Yes. If you are looking at the AUG A3 in the side by side comparison thread, that is the uncommon "high" rail designed for use with the Steyr optic. The standard rail is lower...

Link Posted: 5/7/2010 8:06:47 AM EDT
Added T1 Micro w/ KAC mount measurements.
Link Posted: 9/22/2010 10:40:26 PM EDT
[Last Edit: 9/22/2010 10:42:59 PM EDT by badkarmaiii]
Originally Posted By Onslaught:
Originally Posted By sgtlmj:

If there's anything I missed, please advise.
Thanks for playing.




What about comb height over bore?


Is this ^^^ what you want? I'd like to know too.
I'm guessing it's about .75" for AUGs and clones.
Can anyone confirm?
Link Posted: 12/30/2014 4:10:53 AM EDT
Looks like an AUG M1 scope is around 2.75" That's not really precisely mic'd, but what the tape measure made it look like.
Link Posted: 10/5/2017 7:12:30 AM EDT
Think about if you're one of them MSAR owners that had fallen for that Gig.

With the optic stuck right about the top of the stock.

Wait a second.... I can see my target now..

My friend Bengay is included in my Range bag.
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