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Trijicon ACOG 4x32 BAC Riflescope - 300 Blackout BDC Green Crosshair Reticle & Thumbscrew Mount - TA31-C-100413
Product Description
Equipping an advanced tactical carbine, hunting rifle, or home-defense platform chambered in .300 AAC Blackout for high-velocity tracking and dual-role mission profiles reveals an immediate visual and ballistic bottleneck: general-purpose optics compromise. Standard riflescopes utilize generic reticles that fail to compensate for the massive, stark trajectory variance between high-velocity supersonic cartridges and heavy subsonic subsonic cartridges, forcing shooters into messy manual calculations or constant turret-twisting on the fly. Furthermore, digital optics rely on vulnerable electronic circuits and batteries that fail under brutal field conditions. The **Trijicon® ACOG® (Advanced Combat Optical Gunsight) 4x32 BAC (.300 BLK)** completely eliminates these platform boundaries, merging an indestructible fixed 4x optical engine with a specialized, battery-free dual-illuminated ballistics system calibrated to master the unique physics of the .300 Blackout cartridge.
Precision-forged and meticulously manufactured in Wixom, Michigan, from a solid block of **7075-T6 military-grade aluminum alloy**, the ACOG chassis represents the international benchmark for combat survivability. The structural unibody housing is dry-nitrogen purged and O-ring sealed to deliver absolute waterproof and fogproof tracking performance across shifting thermal climates. The exterior is wrapped in a uniform, non-reflective hardcoat anodized black armor jacket that actively repels trail moisture, chemical bore solvents, and abrasive field scraping on your workbench. At its core is premium, fully multi-coated American-ground glass that maximizes light transmission to yield exceptional edge-to-edge definition, high color fidelity, and absolute distortion-free clarity.
The true technical crown jewel of the **TA31-C-100413** model is its specialized **Green Crosshair 300 BLK Bullet Drop Compensating (BDC) reticle**. Operating completely independent of battery circuits, this advanced sighting engine utilizes Trijicon's patented dual-illumination system: a top-mounted **fiber-optic light-gathering rail** automatically collects ambient daylight to project a vibrant, high-contrast green crosshair during noon-sun tracking, while an internal **Tritium radioactive isotope capsule** supplies a steady, subtle glow in pitch-black midnight blinds. The FFP-style reticle features dual-calibrated BDC staging lanes: the left side provides drop-hash metrics out to 600 yards explicitly mapped to standard **115-grain to 125-grain Supersonic** velocities, while the right side provides distinct holding steps out to 300 yards tuned to the heavy arc of **220-grain Subsonic** suppressed payloads. Outfitted with Trijicon's Bindon Aiming Concept™ (BAC) architecture for fast, both-eyes-open close-quarters target tracking, this combat optic delivers complete tactical authority over your firearm.
*Armorer Bench Notes & Technical Field Assembly Guidance: The Trijicon ACOG TA31-C-100413 comes pre-installed on your workbench with an ultra-rugged **TA51 Dual-Thumbscrew Flattop Mount**. CRITICAL MOUNTING & ZEROING INSTRUCTIONS: When securing the assembly onto your receiver's MIL-STD 1913 Picatinny rail, slide the mount forward or backward to accommodate the fixed **1.5-inch eye relief** signature of the 4x32 optical housing. Hand-tighten the dual thumbscrews firmly into the rail slots, then utilize a coin, flathead screwdriver, or calibrated armorer tool to torque the knobs incrementally to exactly **30 in-lbs**. Do not over-torque, which can stretch the clamp bars. The low-profile windage and elevation turrets yield crisp, audible **2 clicks per inch at 100 yards (0.5 MOA per click)**. The BDC staging is calibrated from the factory based on a strict **100-yard live-fire zero using supersonic ammunition**. Once your primary supersonic baseline is locked on the range, the subsonic drop lines automatically align mathematically along their respective velocity tracks—no secondary dial adjustments required on your bench.
Key Features
- Dual-Calibrated .300 BLK BDC: Specialized reticle features standalone Bullet Drop Compensation lines for both Supersonic and Subsonic cartridges, eliminating manual holdover guesswork.
- Battery-Free Dual Illumination: Combines a top-mounted fiber-optic rail and an internal Tritium capsule to project a high-contrast green reticle 24/7 without electronic circuits.
- Forged 7075-T6 Aluminum Armor: The monolithic combat-proven chassis is milled from ultra-tough structural aluminum alloy to shrug off massive impact shocks, drop drops, and crushing fields.
- Bindon Aiming Concept (BAC): Engineered to facilitate high-speed, both-eyes-open tracking, letting the optic function as a fast reflex sight at close range and a precision scope at intermediate lanes.
- Premium TA51 Thumbscrew Mount: Ships complete with a heavy-duty dual-knob Picatinny mount base that locks onto receivers with zero side-to-side wobble under violent gas backpressure.
Product Specifications
- Brand: Trijicon
- Model Line: ACOG® (Advanced Combat Optical Gunsight) Series
- MPN/SKU: TA31-C-100413 (Also tracked as TA31-300BLK-G)
- UPC Code Profile: 719307308305
- Magnification Power: Fixed 4x Zoom Engine
- Objective Lens Diameter: 32 mm
- Reticle Profile Style: Crosshair Ballistic Reticle with Supersonic/Subsonic Staging (300 BLK BDC)
- Illumination Source Matrix: Fiber Optics (Ambient Daylight) & Tritium Capsule (Low-Light/Night)
- Illumination Reticle Color: High-Contrast Super Laser Green
- Eye Relief Specification: 1.50 Inches (38.1 mm Fixed Compact Eye Box)
- Exit Pupil Graduation: 8.0 mm (Yields Massive Light Staging to the Eye)
- Linear Field of View @ 100 Yds: 36.8 Feet (Broad Tactical Situational Window)
- Adjustment Turret Graduation: 0.5 MOA (Minutes of Angle) Per Click Detent (2 Clicks per Inch @ 100 yds)
- Chassis Housing Material: Forged 7075-T6 Aircraft-Grade Structural Aluminum Alloy Block
- Exterior Finish Shield: Matte Non-Reflective Mil-Spec Type III Hardcoat Anodization
- Mounting Interface Base: TA51 Dual-Thumbscrew Flattop Base (MIL-STD 1913 Picatinny Compatible)
- Environmental Protection: Waterproof to 32 Feet (10 Meters), Fogproof, Nitrogen Purged
- Overall Optics Unit Length: 5.80 Inches (147.3 mm Compact Linear Footprint)
- Net System Mass: 15.10 Ounces (With Mount Base Installed)
- Country of Manufacture: United States of America
