This is my attempt at getting an EOTech FAQ started.

EOTechmodels  front view

EOTech models rear view

Difference between the NV compatible 550 series back plate and the non-NV compatible 510 serise back plate.

Specifications:
Optics: Transmission holography – 100% parallax free
Optic Surface: Anti glare, scratch resistance, non reflective.
Window dimension: 1.20 x .85 (30 x 23 mm)
Window material: 3/16” Laminated
Magnification: 1X
Dimension: 4”L x 1.8”W x 2.25”H (N Battery)
5”L x 1.8”W x 2.25”H (AA Battery)
Weight: 8oz (N battery), 11.5 oz (AA Battery)
Operating Temperature: -20 to 150F
Waterproof / Fog proof
Adjustment: ½ MOA per click @ 100yards (40 MOA range)
Repeat to zero after remount: 1 MOA @ 100 yards
Mount: Picatinny 1913 Std/Weaver mount
Reticle ratio: 28,000:1 brightest to lowest / 10,0000:1 NV setting
Power source: 2 x N batteries(alkaline only) or 2 x AA batteries(all AA models)
Battery life: 300 hours with N batteries, and 800-1000(approx. 1500 with Lithium AA batteries) with AA batteries, brightness setting at 12.
Brightness range: 20 settings, Optic startup at 12. 10 additional setting in NV mode
Battery low indicator: blinking reticle at start up for five seconds
Auto shutdown: 8 hours with the up button and 4 hours with the down button.

To better explain the EOTech is to understand the model designations.
EOTech makes the 500, 510 and the 550 series holographic sights. Those model numbers denotes the option and capability of each model.

Production deciphered:  
500 series civilian models includes
502.A65(A65 denotes the 65MOA circle dot reticle)
no protective hood(can't be retrofitted)
basic electronics
N cell batteries
This is the same model as the Bushnell Holosights that is produced under the same roof at EOTech's Ann Arbor Facility.

510 series law enforcement models includes
511.A65  
511.D1(This is the only model that offers a 1 MOA reticle.)
512.A65(AA batteries)
All 510 series model are manufactured with rubberized button starting May 2004, it is only available with the current Rev F
Protective hood
Upgraded electronics from the 502
Dive rate 33ft

550 series military models includes
551.A65
552.A65
NV compatible
Dive Rate to 33ft, 66ft rating available at special request.
550 series started using the rubberized buttons in 2003 starting with the Rev E

EOTech comes standard with the 3D reticle, the 3D reticle has a 65MOA outer circle with hash mark at 3, 6, 9, and 12 o’clock position, and a 1 MOA dot in the center.

This concept ensure a ultra fast target acquisition time during CQB engagements, and a fine 1 MOA dot for long distance shot out to 250+ yards.
With the EOTech or any other red dot optics, I always recommend zero the unit in at 50 yards which will give a 2-3 inch difference from muzzle out to 250 yards.

Available mount for EOTech

Flat top---------LaRue SpeedLever Mount

ARMS #54 LR1 hi-rise Mount for heads up CQB stance.  seem to work well with the ARMS SIR or #38 SWAM sleeve but the see thru co-witness hole on the mount is too low if the mount is mounted to the flat top.

Carrying Handle----------Precision Reflex Hi-ride Mount for M4 handguards and lo-ride or hi-ride for standard CAR handguard.

Carrying Handle--------Bennie Cooley BC CAM adjustable height mount.

Co-Witness possibilities:
Mounting directly to the flattop with the provided thumb screw, you can use basically any BUIS on the market.  This will put the iron in the center of the optic window.  This is an excellent location for the sole propose of give you a nice big ghost ring if the electronics failed.  


ARMS makes a raiser mount that put the EOTech up high for operator that needs the optic to clear the gas mask or the operator like to shoot from a chest mount head up position.

Mounting via the new LaRue EOTech mount will effective raise your EOTech optic window and put your iron at the lower 1/3 of the optic window.  This will make the iron less obtrusive and you can still just use the window to make shot if the electronics fails.  (LaRue mount is the best way to mount your EOTech to the flattop in my opinion)

Mounting to Carrying handle has two maybe three options
Precision Reflex offers two forward gooseneck mounts, hi-ride mount that will work with M4 or CAR handguards and the standard that will work only with CAR handguards.
Bennie Cooley makes a height adjustable forward gooseneck mount that can be adjusted to fit your handguard height vs. your EOTech height vs. your iron sight.  this is a very versatile mount and although it is adjustable, the mount is actually very robust.  


Starting 2005, all new Rev F has the following upgrades

Battery life increases by 2X
Through and extensive and expensive research and development effort, EOTech has doubled the battery life compared to previously published EOTech statistics. For example, at setting 12 the battery run time increased from 314 hours to 633 hours, Lithium battery run time increased from 500 hours to 1000 hours.!!! The gain is even more substantial at the brighter settings, where battery life is most critical. Available NOW!!

2X Brighter
EOTech has enhanced the electronic circuitry to allow the brightness adjustment range to expand by a factor of 10 times. Now the reticle is 2X brighter at the highest setting. This completely eliminates any concerns over washout in desert or artic conditions. Also with the new improvements the engineer has found the reticle is sharper compare to the older Rev E. Available NOW!!

New Switches on Model 511/512
Model 550, the model 510 will now be upgraded with the latest membrane switch design, providing users with a greater tactile feel and positive snap feeling upon depression of the switches. Raised inlays around the switches provide a clear separation between brightness controls to ensure correct actuation of the operating switches.

natez,

I recommand 50yards for the carbine and 25yards for the SMG as those the factory.

I will find out the distance for everything else.

Quoted: 2X Brighter Which model #s or revision letter indicate if the scope is the newer 2X brightness, or the older revision?  For example, would model 512.A65 be the older or newer type?

It would be the following model with a RevF stamping on the side of the protective hood.
511
512
551
552
Example


Notice the letter F printed on the lower bottom right hand side of the hood.

Quoted: I have a slight issue with the parallax claim......

Parallex free claim is only if you keep the reticle inside the optic window.  Aimpoint don't have this problem because if you cant the sight so much as the dot move pass the optic window, you will have nothing.  Since EOTech have a lrager reticel pattern, you end up pushing the reticle pass the limit of the glass while shooting from some very strange positions.

SMG LEE -

GREAT JOB.

YOU HAVE NOT TOTALLY CONVERTED ME, AS I STILL RUN AIMPOINTS ON MY 10.5", 14.5" AND SIMUNITIONS KIT.

HOWEVER, ON MY DEDICATED "MID-SOUTH RIFLE METAL MANIA" DEDICATED UPPER (LMT RIFLE LENGTH MRP WITH 16" SS BARREL AND MSTN QC BRAKE), I AM NOW RUNNING AN EOTHING. I NEED THE 1 MOA DOT FOR THE 6" PLATES AT 150 YARDS.

ALSO, CONTRACTOR CUSTOMERS ARE REQUESTING EOTECHS JUST TOO OFTEN FOR ME TO IGNORE.

I ABSOLUTELY AGREE THAT THE LARUE TACTICAL EOTHING MOUNT IS THE TICKET ON A FLAT TOP WITH A FIXED FRONT SIGHT.

WES GRANT
M.S.T.N.

Quoted: Optic Surface: Anti glare, anti scratch resistance non reflective. Isn't this an oxymoron?

heheheee, typo.

Thanks for the correction.

Quoted: Hey,SMGLee dose an EOtech co witness without any type of riser like I have to  use With may Aimpoint?  I don't know anything about the sights.  I have a new LE6920 that may need one.  It looks like you just buy the sight and mount it,is it that easy?

EOTech will only co-witness with LaRue mount or the very high ARMS mount.   anyother mount will just raise the EOTech and block your view through your iron.  

With Aimpoint, you are require to purchase a mount.  with EOTech, you can mount it directly to your flattop.

Quoted: can someone post a high quality picture of a flat top ar-15 co-witnessed setup?  i'm interested in a view from the butt looking foward and from the muzzle looking back. thanks.

I will get a bunch of pictures up by this Saturday.

Quoted: Chen, a couple of questions: -Is EOTech a totally USA operation?  design, manufacture, etc. -What is the lowest possible mount available for an EOTech or AimPoint?  Is the EOTech mounted directly on a rail lower than any possible Aimpoint setup(looking for a low mount dot sight for a Benelli M4)   Thanks, Dan

Dan,

EOTech is fully owned by Americans, located in Ann Arbor Michigan.  

For a Benelli S-90, i mount an EOTech to the rail.  It allows for a more heads up shooting stnaces that works great for a tool like the shotgun.  

As far as the lowest possible mount, Aimpoint with the standard X-wide ring, you will have a better cheek weld.

EOTech can be mounted directly to your rail but with the lower housing, it riase the optic window height compare to the Aimpoint with X-wide ring.

Quoted: I think Chen might have mis-spoke a little : The EOTech will co-witness without any sort of mount needed. You can slap it directly on a flattop and still see your iron sights. The LaRue mount will elevate the EOTech so that less of the front sight is seen through the EOTech window, giving you a larger field of view. This is a big plus for the EOTech in terms of cost - the Aimpoint will always require a seperate mount to cowitness correctly on a flattop reciever. Doc

Doc is correct.

EOTech has a build in mount that can be mount directly to the flattop.

Quoted: What about a tritium sight post and if you were running an Eotech 512 cowitnessed as well during night or day?

Front night sight will not effect the sight during day or night. you foucs on the target not the front sight, night sight never came into play visually.

Quoted: Excellent info, Chen.  Thanks! Could you possibly explain what the significant differences are between the Bushnell 52-0021 and the EOTech 512.A65?  I am aware of the protective hood and the rubber faceplate, is that it?   I can get the Bushnell for about $100 less than the 512.  I am trying to justify that additional $100 cost.  A protective hood and rubber faceplate just doesn't cut it for that price in my book.  Are there significant differences in the electronics?  Any light you could shed on this Chen would be greatly appreciated. I'm on a tight budget, but I want to get a good optic, also.   Thanks, Karl

Bushnell is made by EOTech at thier Ann Arbor factory.

Bushnell Holosight don't have the dive rate of the 512, nor does it have the protective hood and rubberized buttons.  The 511/512 will also have a more upgraded electronis.  for range shooting or general plinking, the Bushnell will sever you just fine.

hope this helps.

Only mount that will work for the EOTech on the flat top is the LaRue mount.  The #38 is too high for proper co-witness.

check the pictures I just posted in the starter thread.