The Milbro Clearview Military range of Air Rifle Scopes are a Great Entry Level scope as they come with fitted Universal 9-11mm or 17-21mm mount, Built on Picatinny Rails, Flip Up lens Caps, Illuminated Reticles, and Adjustable Objective for distance ranging. This listing is for the 4 to 12 times magnification scope with a 50mm Front Lens which lets in more light for crisper image. These are also great for the Airsoft Sniper Rifles. These are made from Aluminium .