Note: The two scopes are exactly the same except for their mounting positions. Please pick the right version based on your needs. OKP-7 Russian Optical Targeting Sight. Housing: Full Metal Construction. Weight: 800g (Shockproof Design). Lens: 34mm Large Objective Lens. Transmittance: High Clarity 86% light transmission as per real-world data. Environmental Resistance: Waterproof & Anti-fog Sealed. Classic Green Inverted Triangle Reticle (Rapid Target Acquisition). Auto-Brightness Adjustment (Adapts to Ambient Light Conditions). Mounting: A-K Side Mount Or Compatible with Picatinny/Dovetail Rails. Compatible Battery Sizes: LR44 (Battery Not Included). Our items are located in C. Sometimes there may be force majeure factors causing delays in transportation. We accept return at our cost within 14 days. We may deduct up to 100% if any of these situation occur. We are committed to provide the customer with best service possible.