Description
The Trijicon ACOG 4x32 Riflescope Dual-Illum Red Crosshair FDE 100372 is a high-performance optical sight designed for precision and durability. This Advanced Combat Optical Gunsight (ACOG) features a fixed 4x magnification and a 32mm objective lens, providing excellent clarity and a wide field of view. The scope's body is finished in Cerakote Flat Dark Earth (FDE), offering both aesthetic appeal and enhanced corrosion resistance.
Equipped with Trijicon's renowned dual-illumination technology, this ACOG utilizes both fiber optics and tritium to illuminate the red crosshair reticle. This system automatically adjusts the reticle brightness based on ambient light conditions, ensuring optimal visibility in any environment. The reticle also incorporates bullet drop compensation (BDC) stadia, allowing for accurate long-range shots.
Built to withstand the harshest conditions, the Trijicon ACOG 4x32 features a rugged aluminum-alloy housing that's nearly indestructible. Its compact design, measuring just 5.8 inches in length and weighing 9.9 ounces, makes it an ideal choice for both tactical and hunting applications. The fixed parallax setting and generous 1.5-inch eye relief contribute to its user-friendly operation.
Ideal For: Military and law enforcement personnel, competitive shooters, hunters, and firearms enthusiasts seeking a reliable, high-quality optic for their rifle.
Features:
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DUAL ILLUMINATION SYSTEM: Utilizes fiber optics for daytime illumination and tritium for low-light conditions, ensuring the reticle is always visible without the need for batteries[1].
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RUGGED CONSTRUCTION: Forged from 7075-T6 aircraft-grade aluminum, providing exceptional durability and resistance to harsh environments[1].
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ADVANCED OPTICS: Multi-coated lenses deliver superior light transmission and clarity, enhancing target acquisition and accuracy[3].
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VERSATILE RETICLE: Red crosshair reticle with bullet drop compensation stadia for improved long-range accuracy[3].
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COMPACT DESIGN: Lightweight at 9.9 oz and only 5.8" long, minimizing impact on weapon balance and maneuverability[1][3].
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WIDE FIELD OF VIEW: 7° angular field of view (36.8 ft at 100 yards) for enhanced situational awareness[3].
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WATERPROOF PERFORMANCE: Nitrogen-filled to prevent internal fogging, ensuring clear vision in all weather conditions[1].
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COMBAT-PROVEN: Extensively tested and widely adopted by military and law enforcement agencies worldwide[1].
Specifications:
| Specification | Value |
|---|---|
| Model | TA31-C-100372 |
| SKU | 100372 |
| Magnification | 4x |
| Objective Lens Diameter | 32mm |
| Reticle | Red Crosshair |
| Illumination | Dual (Fiber Optics & Tritium) |
| Body Color | Flat Dark Earth (FDE) |
| Length | 5.8" |
| Weight | 9.9 oz |
| Field of View | 7° (36.8 ft @ 100 yards) |
| Eye Relief | 1.5" |
| Exit Pupil | 8.1 mm |
| Parallax Setting | Fixed |
| Adjustment Click Value | 2 clicks/inch @ 100 yards |
| Housing Material | 7075-T6 Aluminum |
| Finish | Cerakote |
| Waterproof | Yes |
| Battery | None required |
| Warranty | Limited Lifetime |
What's Included:
- Trijicon ACOG 4x32 Riflescope
- Scopecoat
- Manual
- Warranty Card
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Optics Knowledge Center
Understanding Rifle Scope Basics
Magnification
Magnification refers to how much larger an object appears through the scope compared to the naked eye. Fixed power scopes have one magnification setting, while variable power scopes offer a range (e.g., 3-9x).
Objective Lens
The objective lens is the front lens that gathers light. Larger objective lenses (measured in mm) gather more light, providing brighter images in low-light conditions but add weight and require higher mounting.
Reticle
The reticle (crosshair) is the aiming point inside the scope. Modern scopes offer various reticle designs, from simple duplex crosshairs to complex ballistic reticles with holdover points for different distances.
Adjustments
Rifle scopes have turrets for windage (horizontal) and elevation (vertical) adjustments. These are measured in MOA (minutes of angle) or MRAD (milliradians) and allow precise aiming adjustments.
Proper Scope Mounting Guide
Select the Right Rings & Base
Choose rings that match your scope's tube diameter (typically 1", 30mm, or 34mm). Select a base compatible with your rifle's receiver. For heavy-recoiling rifles, opt for stronger mounts.
Install the Base
Clean the receiver and base thoroughly. Apply a small amount of blue Loctite to the screws. Attach the base to the receiver and torque the screws to manufacturer specifications.
Attach the Rings
Attach the bottom halves of the rings to the base. Place the scope in the rings and loosely attach the top halves. Don't fully tighten yet.
Set Eye Relief & Level
Position the scope for proper eye relief (3-4 inches) in your normal shooting position. Ensure the reticle is level using a scope leveling tool. Once positioned correctly, tighten the rings evenly in a cross-pattern.
Scope Zeroing Tips
Start Close
Begin zeroing at a shorter distance (25-50 yards) to ensure you're on paper before moving to your desired zero distance (typically 100 yards).
Use a Stable Rest
Always zero your rifle from a stable shooting position using a bench rest, sandbags, or a shooting rest to eliminate as much human error as possible.
Fire Groups
Fire 3-shot groups before making adjustments. This provides a more accurate representation of where your rifle is shooting than single shots.
Make Deliberate Adjustments
Know your scope's adjustment values (typically 1/4 MOA per click). If your group is 2 inches low at 100 yards, you'll need to adjust up 8 clicks (for a 1/4 MOA scope).
Confirm Your Zero
After making adjustments, fire another group to confirm your zero. Repeat the process until your point of impact matches your point of aim.
Document Your Settings
Once zeroed, record your settings including distance, ammunition used, and environmental conditions for future reference.
Optics Maintenance & Care
Cleaning Lenses
- Start by blowing or brushing away loose particles
- Use a lens pen or microfiber cloth for fingerprints
- For stubborn dirt, use lens cleaning solution (never household cleaners)
- Clean with gentle circular motions from center outward
Protecting Your Optics
- Always use lens caps when not in use
- Store in a dry place with silica gel packets
- Avoid extreme temperature changes
- Use a quality scope cover in harsh conditions
Regular Maintenance
- Check and tighten mount screws periodically
- Inspect O-rings and seals for damage
- Verify zero after rough handling
- Clean the exterior with a damp cloth
What to Avoid
- Never use fingers to touch lenses
- Avoid paper products (tissues, paper towels) on lenses
- Don't use acetone, alcohol, or household cleaners
- Never disassemble your scope (voids warranty)