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Trijicon ACOG 4×32 USMC RCO Riflescope .223/5.56 BDC Red Chevron Reticle Rifle Scope Trijicon
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  • Trijicon ACOG 4×32 USMC RCO Riflescope .223/5.56 BDC Red Chevron Reticle Rifle Scope Trijicon
  • Trijicon ACOG 4×32 USMC RCO Riflescope .223/5.56 BDC Red Chevron Reticle Rifle Scope Trijicon
  • Trijicon ACOG 4×32 USMC RCO Riflescope .223/5.56 BDC Red Chevron Reticle Rifle Scope Trijicon
  • Trijicon ACOG 4×32 USMC RCO Riflescope .223/5.56 BDC Red Chevron Reticle Rifle Scope Trijicon
Trijicon ACOG 4×32 USMC RCO Riflescope .223/5.56 BDC Red Chevron Reticle

Trijicon ACOG 4×32 USMC RCO Riflescope .223/5.56 BDC Red Chevron Reticle

£1,699.99
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Flexible returns

Trijicon ACOG 4×32 USMC RCO Riflescope .223/5.56 BDC Red Chevron Reticle

Features

  • USMC Rifle Combat Optic (RCO) Configuration: Calibrated for the M16A4 20" barrel 5.56 NATO trajectory; issued‑pattern optic with government‑spec kit components.
  • Dual‑Illuminated, Battery‑Free Reticle: Fiber optics power the aiming point in daylight; tritium provides a self‑luminous glow in low/no light—always on, no batteries.
  • Red Chevron .223/5.56 BDC Reticle: Chevron tip is your 100 m zero; descending stadia provide holds for extended range with M16A4 velocity curves. Chevron width may be used for coarse range estimation on silhouette targets.
  • Rugged Forged 7075‑T6 Aluminum Housing: Combat‑proven ACOG durability—shock, recoil, and harsh‑environment resistant; hard‑anodized matte black finish.
  • Wide Situational Field of View: 7° (36.8 ft @ 100 yd) aids scanning and mover tracking while shooting both eyes open (BAC concept).
  • ½ MOA External Adjusters: 2 clicks/inch @100 yd windage & elevation; no tools required for gross correction (caps protect the adjusters).
  • Waterproof / Fog‑Proof: Deep‑water sealed construction; nitrogen‑purged for internal fog resistance.
  • USMC Kit Accessories: Typically ships with KillFlash® ARD, flip caps, TA51 flattop mount, and cleaning/maintenance items (see Included Accessories).
  • Made in USA & Backed by Trijicon Warranty.

Technical Specifications for Trijicon ACOG 4×32 USMC RCO Riflescope .223/5.56 BDC Red Chevron Reticle

Specification

Details

Manufacturer

Trijicon

Model / MPN

TA31RCO‑A4CP / 100226

SKU

TA31RCO‑A4CP

UPC

719307302068

Country of Origin

USA

Magnification

4× fixed

Objective Lens Diameter

32 mm

Optical Design

Fixed‑power prism (integral ACOG housing)

Reticle

Red Chevron .223/5.56 BDC (dual‑illum fiber optic / tritium)

Illumination

Fiber (daylight auto‑bright) / tritium (night); battery‑free

Eye Relief

1.5″ (38 mm)

Field of View @ 100 yd

36.8 ft (7°)

Exit Pupil

8.1 mm

Adjustment Click Value

½ MOA (≈2 clicks/inch @100 yd)

Total Adjustment Range

~40 MOA windage & elevation (ACOG 4×32 class)

Parallax Focus

Fixed ~100 m

Overall Length

5.8″ optic body (~6.7″ typical RCO kit w/ ARD / caps)

Weight

9.9 oz optic‑only; ~15–16 oz typical complete USMC RCO kit (mount, ARD, caps)

Housing Material / Finish

Forged aluminum; matte black hard anodize

Waterproof / Fog‑Proof

Sealed; nitrogen‑purged; deep‑water rated

Shock Resistance

Combat‑rated for duty calibers

Mount Interface

TA51 flattop Picatinny thumbscrew adapter (included)

Included Accessories (USMC RCO Package Contents)

  • TA31RCO‑A4CP 4×32 ACOG (Red Chevron .223/5.56 BDC)
  • TA51 flattop Picatinny thumbscrew mount (Colt‑style)
  • KillFlash® / ARD (anti‑reflection device)
  • Flip‑up objective & eyepiece caps (RCO pattern)
  • Adjuster cap lanyard assembly
  • Lens cleaning tool (LensPen® style)
  • Protective soft cover / packaging (varies)
  • Owner’s manual, RCO zeroing instructions & warranty materials

SEO Keywords
Trijicon TA31RCO‑A4CP, USMC RCO ACOG, 4×32 Red Chevron 5.56 BDC, Marine Corps ACOG M16A4 optic, dual‑illum fiber tritium combat scope.

Frequently asked questions
What is the return policy?

Our goal is for every customer to be totally satisfied with their purchase. If this isn’t the case, let us know and we’ll do our best to work with you to make it right. 14 day return if you are not happy. Things must be unopened and in original packaging, unless it is faulty.
Are any purchases final sale?

No, you can cancel at anytime and will receive a full refund. We will always work with you.
When will I get my order?

Shipping & Delivery

  • We work quickly to process and ship your order as soon as possible.
  • Once your order has shipped, you’ll receive an email with full tracking details.

Delivery Times

  • Standard delivery from our USA suppliers: 7–10 working days (usually within a week)
  • UK Stock Collection items ship within 24 hours.

Stock & Sourcing

  • Due to limited demand, we do not hold inventory in the UK. All products ship direct from our USA suppliers to us then we ship to you so you don’t pay any imports fees.

Insurance & Guarantees

  • Orders over £300: Free Royal Mail Special Delivery (Guaranteed Next Day, Fully Insured)
  • Orders under £300: Royal Mail Tracked service for £3.99
Where are your products manufactured?

Our products are manufactured both in USA and globally. We carefully select our manufacturing partners to ensure our products are high quality and a fair value.

How much does shipping cost?

Shipping & Insurance

Orders over £300 ship free via Royal Mail Special Delivery, guaranteed next day and fully insured.


Orders under £300 ship via Royal Mail Tracked for a flat fee of £3.99.

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Customer Reviews

Based on 1 review
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M
M.R.
M16A4 ACOG

Perfect match for my M16A4 clone.
I was surprised with glass clarity and build quality.
Very fast shipping to CZ.
There are two drawbacks, which can be inconvenient surprise for people who don't know about them.
1. Very short eye relief
2. Right side of reticle is blurry, but that depends on your eye sight.

From Trijicon's FAQ:

The right hand side of the crosshair is blurry. Is this normal?

Yes. The reticle pattern in the ACOG is formed by removing highly reflective metal from a prism mirror. This mirror is at about a 45-degree angle inside the gun sight. This means that the left side of the reticle is closer to the eye than the center of the reticle and the right side of the reticle is further from the eye. The result- the right side of the reticle is focused beyond infinity which can cause distortion on the right side of the reticle. The perceived distortion will be more or less depending on an individual's eyesight. The left side of the reticle is unaffected because the human eye has no difficulty focusing on a closer object. This in no way detracts from the performance of the scope. The image of the target area is not affected. Only the right hand side horizontal reticle line is blurry. This construction is required to achieve a parallax free vertical center of the scope, which allows the built in ranging on the reticle pattern.