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Length/Width/Height: 4"x1.8"x2.25" (102x49x60 mm)
Weight: 8.8 oz (250 grams)
Waterproof: Submersible to 33 ft. depth
Color/Finish: Non reflective black with hard coat finish
Mount: Picatinny (MIL-STD-1913) rail
Return to Zero: Repeatable to 2 MOA after re-mounting
Night Vision Brightness Range: 1,000:1 with NV switch engaged
Power Source: 2x N type 1.5V alkaline batteries (3.0V)
Battery Life: 200 continuous hours at nominal setting 12
NSN: 1240-01-485-0441
A lighter, smaller version of the Model 552, the Model 551 offers the same durability and function, but in a more compact unit. At 4 inches in length, this sight takes up less valuable rail space, leaving more room for a rear iron sight or NV mount.
General Specifications for all Models:
Operation
Optics: Transmission holography - 100% parallax free
Magnification: 1x
Eye Relief: Unlimited
Temperature: -40 degrees to 150 degrees F
Sealing: Fogproof internal optics
Adjustment (per click): 0.5 MOA (1/2" at 100 yds)
Adjustment Range: +/- 40 MOA travel
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: Brightness Adjustment Range: Normal Mode 110,000:1 total range of greater than 30,000,000:1
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.
Night Vision Compatibility
The Model 550 series of sights, which includes the Model 553, Model 552, and Model 551, are fully compatible with all generation levels of night vision intensifier tubes. A special night vision (NV) setting allows the operator to immediately drop the brightness intensity of the holographic reticle to eliminate any "halo" affect while viewing through an image intensifier tube. The Model 550 series can be positioned in tandem behind night vision image intensifiers without any "bloom" of the target area. Now operators can combine the proven night vision technological advantage with a superior, close quarters weapon optic to achieve greatly enhanced weapon aiming - in complete darkness.
Unlike active IR laser pointer systems, the HWS is a passive system and emits no muzzle side signature. While in the NV mode, the HWS is undetectable against enemy night vision surveillance systems, providing operators with a stealth means for effective nighttime weapon aiming.
The Model 550 series' unique switches allow the operator to instantly drop the holographic reticle's brightness to the NV mode of operation. The operator has the ability to toggle back and forth between the NV mode and the normal day/night operation within fractions of a second. The Model 550 series has 10 distinct night vision settings to provide maximum flexibility to the operator. Typically, 3 to 4 brightness settings are not enough to support a host of constantly changing conditions including manufacturing variances in the sensitivities of the image intensifier tubes, varying ambient light environments, and varying light gathering sensitivities of the human eye across users. The Model 550 series still maintains the 20 normal brightness settings for normal day/night operations
The typical configuration is with both the monocular night vision system and the HWS mounted in tandem on the weapon's receiver. Operators can also witness the holographic reticle with head/helmet mounted monocular night vision image intensifier systems, even on a partial cheekweld on the weapon's stock. This allows the operators added flexibility and greater versatility when deploying with night vision systems in the ever changing battlefield environments.
No Revealing Signature
The HWS is a passive weapon optic and does not emit any muzzle side, position revealing light signature. The projected reticle pattern is visible only to the operator. Even Gen III night vision equipment cannot detect muzzle side signature of the operator's position.
The result - the operator remains absolutely undetectable in any operating environment
No Reticle Wash-Out
The HWS's 30 brightness settings (10 settings in NV mode Model 55) ensure the holographic reticle can be instantly viewed in ALL types of lighting environments, cluttered backgrounds and target colors. The HWS delivers an impressive 50,000,000:1 bright to low reticle contrast ratio to ensure the reticle is always clearly viewable.
Reticles can be easily seen against white targets in full sunlight - even in desert or tundra environments. With the HWS, there are no reticle "wash out" conditions as seen in red dot sighting systems. Operators can then adjust to work in moonlit or super low light environments against dark colored targets without "overwhelming" the target scene. For extreme low light conditions, engaging the HWS's night vision mode allows the reticle pattern to be viewed in tandem with the most advanced night vision systems on the market today. The 30 brightness settings provide the operator the flexibility to adjust for optimal conditions in today's ever changing battlefield environments.
* Please Allow Up To 10 Weeks For Delivery
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