This PAO F1 scope really is a tough scope for all kinds of usage. It is rated for all types of firearms and is constructed from high quality aircraft grade aluminium with an anodised finish. The F1 features a first focal plane, half mil-dot reticle with red & green illumination at 7 levels of brightness on a 50mm objective lens. The parallax side focus adjusts from 10 yards to infinity and the scope is shockproof, waterproof, fog proof and nitrogen purged.