Holosun ARO & HM3X Combo Kit — 2 MOA Red Dot, 3x Magnifier

Holosun ARO & HM3X Combo Kit (ARO-RD2 & HM3X) is a rifle optic package that pairs an enclosed 2 MOA red dot sight with a 3x magnifier, allowing rapid transitions between close-range engagements and magnified mid-range shooting. Designed for Picatinny-mounted rifle platforms, this combo provides a compact, low-profile aiming solution without requiring optic changes or re-zeroing.

Manufactured by Holosun, this kit addresses the common need for flexibility on modern rifles. The ARO red dot offers fast, parallax-free aiming at 1x, while the HM3X magnifier adds selectable 3x magnification for improved target identification and precision. The system is well suited for range use, training, and general-purpose rifle setups where versatility and durability are priorities.

Key Features

• 2 MOA red dot reticle for precise aiming and fast acquisition

• 22mm enclosed optic housing designed to pair with Holosun magnifiers

• Lower 1/3 co-witness pedestal mount (1.63-inch height) for AR-style rifles

• HM3X 3x magnifier with adjustable diopter for user-specific focus

• Extended eye relief for comfortable magnified shooting

• CR2032 battery power with Shake Awake technology

• 12 brightness settings, including 2 night-vision-compatible levels

• IP67-rated water and dust resistance

• Protective hard case included for transport and storage

Specifications & Construction

• Optic Type: Enclosed red dot with flip-to-side magnifier

• Reticle: 2 MOA red dot

• Objective Size: 22mm

• Magnification: 1x (ARO) / 3x (HM3X)

• Housing Material: Aluminum

• Mounting Interface: 1913 Picatinny / Weaver rail

• Power Source: One CR2032 battery

• Weight: Approx. 5.56 oz (optic component listed)

• Environmental Rating: IP67 water and dust resistance

• Listed Dimensions: Approx. 3.95 × 6.95 × 9.25 in (packaged system)

The enclosed aluminum construction improves durability in training and field environments, while the lower 1/3 co-witness height supports use with standard AR iron sights. Shake Awake technology helps extend battery life by powering the optic down when not in motion.

Compatibility & Intended Use

The Holosun ARO & HM3X Combo Kit is designed to mount directly to 1913 Picatinny rails, making it compatible with AR-style rifles and other platforms equipped with Picatinny or Weaver rails.

Typical applications include:

• General-purpose AR-15 setups

• Training and range rifles

• 1x red dot use with optional 3x magnification

• Rifles requiring a compact optic and magnifier combination

This configuration supports rapid engagement at close range with the ability to transition to magnified shooting for targets at moderate distances.

What’s Included

• Holosun ARO-RD2 enclosed red dot sight

• Holosun HM3X 3x magnifier

• Lower 1/3 co-witness mounting hardware

• Protective hard case

• Manufacturer documentation

The Holosun ARO & HM3X Combo Kit offers a balanced optic solution for shooters seeking a durable red dot and magnifier pairing that supports both speed and precision on Picatinny-equipped rifles.