Field of view is optimized by integrating high quality prisms that maintain the rectangular shaped sight picture of the HWS, and since the illuminated reticle image is imbedded within the HWS, there is no risk of losing zero when the magnifier element is taken off or re-attached. Additionally,the base of the 557 HWS has been modified to reduce the amount of rail space required to effectively mount the system, making this ideal for the M4/AR15 flat-top platform.

For the infantryman, target ranges vary in ever-changing battlefield conditions. The MPO provides a solution for engaging threats in CQB situations, then quickly transitioning to a 500m targeting or surveillance situation, and then quickly back to a 25m room clearing exercise. Instant transition is achieved through a quick Flip-to-Side (FTS) mount or optional fixed mount (FXD) that offers a simple, quick disconnect feature to remove the 4X magnifier. This durable, night vision compatible system offers wide field optical performance with superior light transmission for visibility in extreme low light conditions.

Buttons on left side to work specifically with NV or magnifiers
AA Battery model (supports Lithium or Alkaline)
Ballistic reticle specific to .223 caliber munitions
Compatible with Gen I-IV Night Vision Systems (tandem operation)
Raised 7mm base

Specs:

Mount
Length: 1.6" (40.6mm)
Height: 1.64" (41.65mm) Clears common low profile flip up rear iron sights
Weight: 4.0 oz (113 grams)
Color/Finish: Non reflective black with hard coat finish
Flip Orientation: Non Flip, ambidextrous mount
Rail Interface: Fixed Picatinny with single mounting bolt.
Magnifier Interface: Retained by ARMS® throw
Optical Axis Adjustment: Horizontal and vertical adjustments within mount
Works with either 3x or 4x HWS magnifier

Magnifier
Magnification Fixed: 3.75X
Eye Relief: 1.65" (42mm)
Length: 4.6" (117mm)
Weight: 12oz (340 grams)
Temperature: -40 to 160 F
Waterproof: 33 ft.
Sealing: Fogproof internal optics
Color/Finish: Non reflective black with hard coat finish
Mount: Integrated dovetail for use with quick detach mount
Retrofits to all HWS models

Operation
Optics: Transmission holography - 100% parallax free
Magnification: 4x
Eye Relief: Unlimited
Length/Width/Height: 5.70"x2.1"x2.8" (133x49x71 mm)
Weight: TBD
Temperature: -40 to 150 F (using AA lithiums); -20 to 140 F (AA Alkaline)
Waterproof: Submersible to 33 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: 1" Picatinny (MIL-STD-1913) rail
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: AR223 BDC reticle with additional drop point dots for 400, 500, and 600 meters

Electrical
Brightness Adjustment Range: 110,000:1 brightest to lowest
Night Vision Brightness Range: 1000:1 with NV switch engaged
Function Button Location: Left side near the rear of sight
Power Source: 2x 1.5V AA batteries (supports lithium, alkaline, or rechargeable)

Battery Life: 1,000 continuous hours (lithium) at nominal setting 12; 600 continuous with AA alkaline
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