The Vortex Strikefire II Red Dot's larger objective and 30mm tube design provides a larger field of view compared to other red dots and allows it to be mounted at just about any height using common 30mm rings. A nicely sized 4 MOA dot is easy to acquire quickly, and is available in red only or user-selected red/green. From AR-15s to shotguns, the Strikefire 2 offers big time versatility at a reasonable price. The bright red (or green) dot has 10 brightness settings including 2-night vision levels. Typical battery life is 300-600 hours and the scope has a built in 12-hour auto-shutdown feature to maximize its performance. The lower 1/3 co-witness cantilever mount model is ideal for AR platforms, positioning the optic bore center 40 mm above the base surface.