Strike Systems Advanced 551 Red Dot — Black

The Strike Systems Advanced 551 is an open red dot for airsoft with selectable red or green dot, designed for fast target acquisition on replicas with a Picatinny or Weaver rail. At 210 grams, it stays compact without adding noticeable weight to the replica.

The choice between red and green dot is not just a gimmick: against dark backgrounds or in low light, the human eye perceives green with greater contrast, while red reads more clearly against bright backgrounds or in full daylight. Having both on the same unit means you never need to swap optics as lighting conditions change during a game. Brightness adjustment further refines dot clarity, preventing washout outdoors and loss of definition indoors.

Windage and elevation are adjustable, allowing you to zero the sight on whichever replica you are running. The battery compartment — four AG13/LR44 cells — opens via a lever, a solution that allows field replacement without tools, though it does require carrying spare batteries since this format is less common than CR2032. Batteries are not included. Mounting is by screw lock on any standard Picatinny or Weaver rail.

Key points

• Selectable red/green dot adapts to lighting conditions without swapping sights
• Brightness adjustment keeps the dot readable both outdoors and indoors
• Adjustable windage and elevation allow zeroing on the specific replica
• Lever-open battery compartment allows fast field replacement without tools
• The compact weight of 210 grams does not burden the replica
• Screw-mount compatible with standard Picatinny and Weaver rails

In the box

• Strike Systems Advanced 551 red dot