BSA Tactical Weapons 4x20mm Scope with 30/30 Duplex Reticle and AR Handle-Style Mount: * Features: * Fully multi-coated optics * Quick-detach mount fits all AR-style carry-handle upper receivers * Ballistic compensating elevation and coin-style windage adjustment turrets * Fogproof, shockproof and waterproof * Magnification: 4x * Object lens diameter: 20mm * Field of view at 100 yds: 23.6" * Parallax setting: 50 yds * Click adjustment value: 1/4 * Adjustment range: 40-40 * Weight: 18 oz * Dimensions: 2.7"L x 1.6"W x 1.2"H * Model# TW4X20