Dear Friend, welcome to Our store. We are a sight manufacturing factory in China. If you want to purchase sight in bulk and get more factory information, please contact online customer service. You will get an unexpected purchase price . Have a nice day Features: M9 3-10x42 E Compact Rifle Scope Plus Red Laser Nitrogen Filled, Fully Multi Coated, Shockproof, Fogproof Waterproof, Dual Illuminated Red/Green Reticle with 3 Tactical Rails, by Accurate Optics Compact Mil-dot scope 8.5 overall length, perfect for 5.56mm or similar rifles Multiple-coating lens Red/Green Illuminated Mil-dot Reticle Build-in Low Profile Picatinny Mount and Accessory Rails Adjustable Windage Elevation Lens cover included Recommended for .223/5.56mm, 7.62x39mm/5.45x39mm and .22 rifles Specification: Magnification: 3X -10X Objective diameter:45mm 1 tube, Nitrogen filled Emerald Coated Lens Eye Relief: 3 Material: Aluminum Alloy Build-in Low Profile Picatinny Mount Armored Rails Overall Length: 205mm Mount Base Length: 50mm 1 x M9 3-10x42 Scope 2 x Lens Cover 2 x Wrench 1 x Cleaning Cloth 1 x English user manual Battery not included Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you. Please allow 1-2cm measuring deviation due to manual measurement.