Eotech 553 Military Model Holographic Sight After extensive testing of various optical sights, US Special Operations Command has standardized on the HWS as its 1X weapon optic for close quarter, urban combat zones. To meet the stringent requirements set and demanded by our elite fighting forces, L-3 EOTech has developed the SU-231/PEQ (Model 553), modeled after the ever popular, battle proven HWS design.The SU-231/PEQ (Model 553) incorporates many additional features required within the SOPMOD Block 2 program. Standardized as the weapon sight of choice by America's warrior elite, the US Special Operations Command. All black unit USSOCOM standardized, Type Classified SU-231/PEQ Dual ARMS throw levers with 7mm raised base 66ft. submersion rating CR123 Lithium battery 65MOA ring/1MOA dot reticle pattern Eotech 553 Military Model sight with standard 2D reticle pattern, ARMS throw levers and 123 battery power is one of newest sights from Eotech. The design improvment were in response to Military specification that include the height being raised 7mm to provide a consistent cheek weld with all other standardized optics. The Eotech 553 has been is now submersible to a 66 ft. depth. Along with this design imrovement, the rubber control pad has been redesigned to improve the feel of the push button switches. The switches are designed with raised inlays to provide further separation between switch controls and reduce audible signature. Operation Optics: Transmission holography - parallax free Magnification: 1x Eye Relief: Unlimited Length/Width/Height: 4.9"x1.8"x2.8" (124x49x71 mm) Weight: 14 oz Temperature: -40 to 150 F Waterproof: Submersible to 66 ft depth Sealing: Fogproof internal optics Color/Finish: Non reflective black with hard coat finish Adjustment (per click): 0.5 MOA (1/2" at 100 yds) Adjustment Range: +/- 40 MOA travel Mount: USSOCOM requirements dictated dual quick release throw levers designed specifically for the Picatinny (MIL-STD-1913) mounting rail: Certain commercial variants of the MIL-STD-1913 rail specification may not be compatible with the SU-231/PEQ (M553) mounting assembly. The SU-231/PEQ (M553) base consists of (2) ARMSŪ throw levers and is only adaptable to rails that properly accept the ARMSŪ design. Return to Zero: Repeatable to 1 MOA after re-mounting Heads-Up-Display Window Optical Surfaces: Anti-glare coating Window Dimensions: 1.20" x 0.85" (30 x 23mm) Front Window Material: 1/8" solid glass Rear Window Material: Shatter resistant laminate (3/16" thick) Field of View (100 yds): 30 yds (28m) at a 4" eye relief Standard Reticle: 65MOA circle with quadrant ticks with 1 MOA aiming dot Electrical Brightness Adjustment Range: 146,000:1 brightest to lowest Night Vision Brightness Range: 1280:1 with NV switch engaged Power Source: 2 x 123 lithium batteries Battery Life: 1100 continuous hours at nominal setting 12 Brightness Settings: 30 settings with scrolling feature (10 settings for NV use) Auto Battery Check Indicator: Flashing reticle upon start-up Auto Shut-down: At 8 hrs- programmable to 4 hrs