Ultimate Arms Gear Tactical Air Rifle Stealth Black Adjustable Glowing Fiber Optic Front & Rear Sight Tower with Built in Integral Weaver-Picatinny Mount Deck AR15 AR-15 M4 M16 Designed to be used on Air Rifles. Front and Rear Sight Are Adjustable to Reach Optimal Accuracy. An Excellent Tactical Upgrade For an Air Rifle - No Gunsmithing Required.