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

Standardized by the DEA, ATF, and FBI SWAT, the Model 552 is by far the most popular HWS model. This NV compatible, AA battery model is the sight of choice by military units like Stryker Brigade, 10th Mountain, and 3rd Infantry. It is battle proven to withstand the abuse that any harsh environment, high powered weapon platform, or military mission can dish out.

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.