There are two Viper variations: one with a single 3 MOA dot and ... a fan of using red dots for wingshooting, the multi-reticle options have application here. According to Vortex, the 32 MOA ...

Red dot sights have become very popular on rifles ... blocking problem by being fully enclosed. The FastFire E has a 3.5 MOA dot that is always on with an estimated 60,000 hour life.

Check out the Vortex Viper version with selectable reticles. The unit offers seven reticle choices ranging from the simple 3 MOA red dot to a 65 MOA circle for shotshell patterning, 32 and 65 MOA ...