There are several EOTECH 557 Holographic Weapon Sight, AR223 Reticle, NV Compatible, AA Battery (557.AR223) available in our stock. We are putting them on sale for $499.00 each, so you save $201.00 Summary: The new customized AR223 reticle provides a multi-purpose image that is calibrated to the trajectory of the M4 Carbine. The circle/dot reticle is combined with four 1 MOA aiming dots that are vertically aligned and calibrated specifically for the ballistic drop of .223 caliber ammunition. The tested design of this HWS is waterproof (submersible to 33 feet depth), shockproof, fogproof, and withstands extreme temperature variations. [*]The buttons are on the left side, moved from the back for instant access, allowing a magnifier, night vision, or a back up iron sight to fit closely to the HWS body. A part of the front base has been lifted, so the sight can fit over standard hand guards found on many M-4 or M-16 style weapons. Technical Characteristics: 5.70 x 2.1 x 2.8 [*]1x Magnification [*]FOV of 30 yds (28m) at a 4" eye relief [*]Brightness Adjustment Range 146,000:1 brightest to lowest [*]Transmission holography - parallax free 1" Weaver or Picatinny (MIL-STD-1913) rail Notable: Buttons on left side of sight (not in back) to work specifically with NV or magnifiers Compatible with Gen I-III+ Night Vision Systems (tandem operation) Raised 7mm base with knurled cross bolt Ballistic reticle specific to .223 caliber munitions Fogproof internal optics Includes a Limited 2 Years Warranty If you are interested in this EOTECH Holographic Weapon Sight send me an email to email@example.com.