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Trijicon ACOG 4x32mm — OD Green — Illuminated Red Chevron .223/5.56 BDC Reticle (100309) — Informational Overview
The Trijicon ACOG 4x32mm in OD Green is a fixed-magnification optic configured with an illuminated red chevron reticle and a .223/5.56 BDC (bullet drop compensating) reticle system. This model is identified by part number 100309 and UPC 719307307230. ACOG optics are known for compact fixed-power designs that combine an etched reticle with an illumination system intended to maintain reticle visibility across changing lighting conditions (exact illumination behavior depends on the specific model).
Key Identifiers
Brand: Trijicon
Product Line: ACOG
Magnification: 4x (fixed)
Objective Size: 32mm
Reticle: Illuminated Red Chevron
BDC Caliber Reference: .223 Rem / 5.56 NATO BDC
Color: OD Green
Model / Part Number: 100309
UPC: 719307307230
4x32 Fixed Magnification: Consistent Sight Picture and Simple Operation
A 4x fixed-magnification optic provides a consistent magnification level without variable zoom controls. In general use, fixed-power optics are often selected when users want:
A repeatable sight picture with no magnification changes
Fewer external adjustments compared with variable-power designs
A compact profile relative to many magnified scope options
A 32mm objective lens is commonly associated with a balance between light collection and a relatively compact overall size.
Illuminated Red Chevron Reticle: Distinct Aiming Reference
This configuration uses an illuminated red chevron reticle. Chevron-style reticles typically provide:
A highly recognizable shape with strong contrast
A defined aiming point (often the chevron tip) for precision holds
A reticle form that can remain readable against varied backgrounds
Perceived brightness and visibility can vary with ambient lighting, user vision, and the illumination system used in the specific optic model.
.223/5.56 BDC Reticle: Holdover References and Practical Variables
This ACOG is listed with a .223/5.56 BDC reticle, intended to provide hold references that correspond to bullet drop at increasing distances. In practice, BDC alignment depends on:
Ammunition selection (bullet weight and velocity)
Barrel length and muzzle velocity
Zero distance and sight height over bore
Atmospheric conditions (temperature, altitude, pressure)
Many users validate BDC holds by confirming impacts at known distances with their chosen ammunition and rifle configuration.
OD Green Finish: Color Matching and Low-Profile Appearance
The OD Green finish is commonly chosen to match or complement green/earth-tone equipment and hardware. As with most colored finishes, slight shade variation can occur between production runs and across different materials, but the intent is a subdued, non-reflective green exterior.
Mounting and Setup Notes (General)
Optic setup typically involves verifying:
The mounting interface and required mount type
Eye relief needs and appropriate mounting position
Proper torque and secure fastening per manufacturer guidance
Clearance with backup sights or other accessories, if used
Because packaging can vary by retailer, users often confirm whether mounting hardware is included with the specific listing or required separately.
Responsible Use and Compliance Notes
Optics and related equipment may be subject to export controls and local regulations depending on jurisdiction. Users typically confirm compliance requirements for lawful ownership, transport, and any international travel.
Quick Reference Summary
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