551 Red Dot Sight Laser Green Dot Sights Holographic Rifle Scope reflexive sight

Optics: Transmission holography - parallax free
Magnification: 1x
Eye Relief: Unlimited
Length/Width/Height: 5.4"x2"x2.25" (137x50.8x57 mm)
Weight: 10.9 oz (309 grams)
Temperature: -40 to 150 F (using AA lithiums); -20 to 140 F (all other battery
choices)
Waterproof: Submersible to 10 ft depth
Sealing: Fogproof internal optics
Adjustment (per click): 0.5 MOA (1/2" at 100 yds)
Adjustment Range: +/- 40 MOA travel
Mount: 1" Picatinny (MIL-STD-1913) or Weaver rail
Return to Zero: Repeatable to 1 MOA after re-mounting