For dependable performance in the field, the Firefield 1 x 30 Multireticle Dot Sight Scope features nitrogen-purged aluminum housing that is IPX6 weatherproof, shockproof and fog proof. Four different reticles allow you to customize the way you acquire your target, and the scope boasts a parallax-corrected design to keep the reticle stable no matter the distance to the target or your aiming position.