EOTech 556 User Manual
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Be sure to leave a name, contact number, return shipping address, and failure description in the
email or on a voice mail. This will allow the manufacturer to generate a Return Authorization Number (RA#)
to include with the sight(s). DO NOT SHIP THE SIGHTS WITHOUT A RETURN AUTHORIZATION
NUMBER (this will severely delay the turn around time on repair or replacement).
4.
If you require, fill out a DD Form 1149 to include with the sight(s) you will return. Include a
reference to the RA#, and a signature line for EOTech’s Service Department to sign indicating the receipt of
materials. The signed copy will be mailed, faxed, or emailed back to you upon receipt of the sight(s) for the
purposes of accountability.
5.
If the manufacturing date located on the bottom of the sight is more than two years old, a fee will be
assessed for repair to include the cost of both parts and labor. A purchase order will be required to process
the repair. Please contact EOTech for an estimate.
Please send the unit postage prepaid, to address listed in Appendix B. Please include your name, address,
telephone number, and a written description of the problem you are encountering, and also include the RA#.
Whenever possible, ship the sight in its original box.
2.5 Installation of Equipment
MOUNTING
The 557.AR223 is equipped with mounting hardware to attach to a MIL-STD-1913 Picatinny style rail. To
achieve the best results and accuracy, the HWS must be mounted properly. The Picatinny rail needs to be
parallel to the bore to permit the maximum elevation and windage adjustments. If it is required, it is strongly
recommend that the weapon rail be installed by a qualified gunsmith.
1.
Locate the crossbar and clamp on the underside of the sight.
2.
Loosen the slotted lock knob until resistance to turning is felt.
3.
Place the crossbar in a groove on the top of the weapon rail. Individual preference and the specific
firearm determine the optimal position on the weapon rail.
4.
Make sure the crossbar is inserted fully into the rail’s groove and push the sight as far forward as
possible.
5.
Tighten the slotted lock knob, rotating the bolt until resistance is felt. Use a coin, screwdriver, or
other type of flat tool to rotate the bolt head an additional 3/4” turn to fully tighten.
NOTE 2: A Picatinny rail cannot be installed directly on some weapons. EOTech sells mount adapters to
provide a standard Picatinny rail for various weapons used in today’s military and law enforcement
applications. Contact a Factory representative if you are unclear on the mounting adapter you should use on
your weapon.
2.6 Zeroing Procedures
Refer to the section on Windage and Elevation Adjustments (Section 2.1.6) to zero the 557.AR223. The
following are some additional reference aids that can be used during the zeroing process.
BORE SIGHTING
Bore sighting is a good preliminary procedure in achieving proper alignment of your sight to the firearm. A
chamber laser/ bore sighter is an aid in achieving collimation.
LIVE FIRE SIGHTING FOR AN M-4 OR M-16
To adjust the top aiming dot of the 557.AR223 reticle from 10 to 300 meters, the sight can be zeroed at 25
meters using a standard M4/M16 military zeroing target. With the dot aimed at center mass of the target, the
sight should be adjusted so the round lands approximately 1 cm below the point of aim at 25 meters. This
method of zeroing ensures hitting a target at 100-200 meters where fine tuning should be conducted.
Additionally there are custom targets for 25m zeroing used with the M-4 and M16 (see Figure 6), and for
Laser Bore Sighting (see Figure 7). Please visit the manufacturer’s website at www.eotech-inc.com or
contact the manufacturer for copies of these targets