EOTech 556
The EOTech 556 sports a few of the company's recent improvements to their holographic weapon sights. The most notable of these is the fact that the buttons for the sight that allow you to control brightness and power the unit on and off have been shifted from the rear to the side. This may not sound like a huge deal but if you use or intend to use another optic such as a magnifier (or even closely mounted back up iron sights) this feature makes it much easier and faster to reach the sights controls. Many users have noted that it's a bit more natural to go for the controls on the side even without the problem of the rear panel being blocked. In addition to the shifting of the controls the front end of the EOTech 556 has a raised base to allow for mounting over standard hand-guards often found on M-16 and M-4 style rifles. This optic uses the standard fast aiming reticle with both a 65 MOA circle and a 1 MOA dot. And of course it's as tough as any EOTech and submersible to thirty-three feet.
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 EOTech Holographic Weapon Sight 556.A65 NV Compatible  US $508.95
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 Scopecoat Cover FITS Eotech 553, 556 & 516.A65 Sights US $13.95
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 EOTech 556.A65 Holographic Sight, 1 MOA Dot, NEW! US $505.00
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EOTech 556 Heads-Up-Display
* Standard Reticle: A65/1
* Front Window Material: 1/8" solid glass
* Window Dimensions: 1.20" x 0.85" (30 x 23mm)
* Optical Surfaces: Anti-glare coating
* Field of View (100 yds): 30 yds (28m) at a 4" eye relief
* Rear Window Material: Shatter resistant laminate (3/16" thick)
EOTech 556 Operational Specs
* Optics: Transmission holography - parallax free
* Mount: 1" Picatinny (MIL-STD-1913) rail
* Eye Relief: Unlimited
* Waterproof: Submersible to 33 ft depth
* Adjustment (per click): 0.5 MOA (1/2" at 100 yds)
* Weight: 11.9 oz (372 grams)
* Temperature: -40 to 150 F
* Magnification: 1x
* Sealing: Fogproof internal optics
* Return to Zero: Repeatable to 1 MOA after re-mounting
* Color/Finish: Non reflective black with hard coat finish
* Length/Width/Height: 5.1"x2.1"x2.8" (130x53x71 mm)
* Adjustment Range: +/- 40 MOA travel
EOTech 556 Electrical Specs
* Brightness Adjustment Range: 146,000:1 brightest to lowest
* Auto Shut-down: At 8 hrs- programmable to 4 hrs
* Night Vision Brightness Range: 1280:1 with NV switch engaged
* Auto Battery Check Indicator: Flashing reticle upon start-up
* Power Source: 2x 3.0V Lithium 123 batteries
* Brightness Settings: 30 settings with scrolling feature (10 settings for NV use)
* Battery Life: 1,000 continuous hours (lithium) at nominal setting 12; 600 continuous with AA alkaline
* Function Button Location: Left side near the rear of sight
