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.
| Operation |
|
| Optics |
Transmission holography - parallax free |
| Magnification |
1x |
| Eye Relief |
Unlimited |
| Length/Width/Height |
4\"x1.8\"x2.25\" (102x49x60 mm) |
| Weight |
8.8 oz (250 grams) |
| Temperature |
-20 to 140 F |
| 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 |
Picatinny (MIL-STD-1913) rail |
| Return to Zero |
Repeatable to 2 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 |
| Reticle Options |
65 MOA, Single 1 MOA dot, Special less lethal pattern for Sage and FN |
| Electrical |
|
| Brightness Adjustment Range |
110,000:1 brightest to lowest
|
| Night Vision Brightness Range |
1000:1 with NV switch engaged
|
| Power Source |
2x N type 1.5V alkaline batteries (3.0V) |
| Battery Life |
200 continuous hours at nominal setting 12 |
| 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 |
