Trijicon ACOG TA55 5.5x50mm Riflescope W/ Mount, Illuminated Red Chevron .223 Rem/5.56mm BDC Reticle Overview: The Trijicon ACOG 100173 is a 5.5x fixed-power riflescope designed for rifles chambered in .223 Remington/5.56mm. It features an illuminated red Chevron ballistic drop-compensating reticle, a 50mm objective, and a multi-coated optical system. The optic includes a TA51 flattop mount and features a black hardcoat anodized aluminum housing. Key Features: 5.5x Fixed Magnification: Provides increased target observation and aiming capability compared with lower-power optics. 50mm Objective: Large objective lens designed to support light transmission and a generous 8.89mm exit pupil. Illuminated Red Chevron Reticle: Chevron aiming point with .223 Remington/5.56mm ballistic compensation. BDC Reticle: Calibrated for the specified .223 Rem./5.56mm application. TA51 Flattop Mount: Includes a factory mounting solution for compatible flattop rifle platforms. Multi-Coated Optics: Optical surfaces feature multi-coating for improved light transmission. Aluminum Construction: Lightweight housing with black hardcoat anodized finish. Broad Parallax Range: Listed parallax adjustment range extends from 5 yards to infinity. Includes: Thumbscrew Flattop Adapter (TA51), 5.5x50 Scopecoat (TA65), LENSPEN (TA56), Lanyard Assembly for Adjuster Caps (TA71E) Specifications: Brand: Trijicon Model: ACOG MPN: 100173 Magnification: 5.5x Objective Diameter: 50mm Reticle: Illuminated Red Chevron .223 Rem. / 5.56mm BDC Material: Aluminum Mount Type: ACOG Flattop Mount Included Mount: TA51 Flattop Mount Finish: Black Hardcoat Anodized Optic Coating: Multi-Coated Field of View: 18.40 ft. @ 100 yds. Eye Relief: 2.20" Exit Pupil Diameter: 8.89mm Adjustment Size: 5 clicks per inch @ 100 yds. Parallax Adjustment: 5 yds. to Infinity Length: 12" Height: 2.70" Width: 2.50" Weight: 25.60 oz. Applications: Rifle Target Shooting: Provides magnified viewing and an illuminated aiming point for compatible rifles. Range Training: Suitable for practicing precision shooting at varying distances. Sport Shooting: Designed for lawful recreational and competitive rifle applications where appropriate. Optics-Ready Rifle Platforms: The included TA51 mount is intended for compatible flattop mounting systems. Additional Features: BDC Configuration: The reticle is specifically designated for .223 Remington/5.56mm ballistic compensation. Fixed-Power Design: 5.5x magnification provides a consistent sight picture without a variable-power mechanism. Large Exit Pupil: The listed 8.89mm exit pupil supports a generous viewing aperture. Durable Housing: Aluminum construction and hardcoat anodized finish provide a robust exterior. MPN: 100173UPC: 719307302020