Description

Holosun ARO-CORE-GR-2 — Compact 2 MOA Green Dot Red Dot Sight, 22 mm Window, Shake Awake

Name: Red Dot Sight HOLOSUN ARO-CORE-GR-2 — Compact 2 MOA Green
Brand: HOLOSUN
Price: 215 CHF
Availability: InStock

Overview

The Holosun ARO-CORE-GR-2 is a compact and lightweight red dot sight — just 96 g for the optic alone — designed for modern rifle platforms: AR-15, PCC, semi-automatic and bolt-action rifles with Picatinny rail. It's the Green Dot single-reticle version of the ARO CORE (Advanced Rifle Optic) Holosun line, positioned to deliver sport shooters and rifle enthusiasts a premium red dot in 2 MOA green at a controlled price.

Its defining feature: a 2 MOA green dot (LED 540 nm) — the high-visibility green reticle that leverages the human eye's peak sensitivity to this wavelength. Result: a dot perceived as brighter than red at equal electronic intensity, particularly readable on light targets, cardboard silhouettes, steel targets and urban backgrounds, with reduced eye fatigue during long sessions.

The enlarged 22 mm optical window, Shake Awake technology, side-loading CR2032 battery (replacement without disassembly), 50,000-hour autonomy and 10 daylight + 2 night vision settings deliver a premium user experience. MAO hard-anodized aluminum housing, IP67 water resistance, 1000G vibration resistance.

Delivered with TWO Picatinny mounts — the 1.63" central mount for lower 1/3 co-witness with AR-15 iron sights, and the 1.05" low mount for bolt-action / precision / hunting configurations — the ARO-CORE-GR-2 is immediately adaptable to nearly all Picatinny rail platforms. It uses the T1 / T2 footprint, the universal market standard for compact red dots.

Key Features

2 MOA Green Dot: superior perceived brightness thanks to the human eye's peak sensitivity at 540 nm.
22 mm optical window: expanded field of view — faster target acquisition.
Ultra-compact and lightweight: 96 g for the optic alone — among the lightest red dots in its class.
Shake Awake: motion-activated on, auto-off after inactivity.
50,000-hour battery life — over 5 years of continuous use at medium setting.
Side-loading CR2032: battery replacement without removing the optic — no need to re-zero.
10 daylight + 2 night-vision brightness settings.
Two mounts included: 1/3 co-witness (1.63") + low mount (1.05").
T1 / T2 footprint: universal standard — compatible with most premium third-party mounts.
MAO hard-anodized aluminum construction, IP67 waterproof, 1000G shock resistance.
1x magnification + parallax-free + unlimited eye relief.

Full Specifications

Optics

Light source: LED (540 nm — Green)
Reticle: 2 MOA Green Dot
Magnification: 1x
Parallax: parallax-free
Eye relief: unlimited
Multi-coatings: yes

Electronic Functions

Shake Awake: yes
Auto Off: yes
Memory: yes
Manual brightness: 10 daylight + 2 night vision
Automatic brightness: no
Solar Power: no
Lockout Mode: no

Power

Battery type: CR2032
Battery life: 50,000 hours
Removable battery: yes
Battery location: side tray

Mechanical

Housing: aluminum
Surface finish: MAO hard-anodized
Color: black
Adjustment per click: 0.5 MOA
W&E travel range: ±50 MOA
Storage temperature: -40°C to +70°C
Working temperature: -30°C to +60°C
Waterproofing: IP67
Vibration resistance: 1000G

Physical

Window diameter: 22 mm (0.866")
Body dimensions: 63 × 39 × 67 mm (2.48" × 1.54" × 2.63")
Optic weight: 96 g (3.38 oz)
Central mount height: 1.63"
Low mount height: 1.05"
Mount weight: 49 g (1.73 oz)

Mount Compatibility

Direct mount: Picatinny (MIL-STD-1913)
Footprint: T1 / T2 — universal compact red dot standard (compatible with most third-party mounts: Scalarworks, ADM, GDI, Reptilia, Geissele, Warne, etc.)
Two mounts included: 1.63" lower 1/3 co-witness + 1.05" low mount

Why 2 MOA Green Dot?

The green dot is a notable evolution over the classic red reticle. Its 540 nm wavelength offers several advantages:

Peak human eye sensitivity: the human retina is more sensitive to green than red → the dot appears brighter at equal electronic intensity → energy savings and less eye-dazzling in prolonged use.
Superior contrast in bright environments: green stands out better than saturated red in full sunlight or on neutral backgrounds.
Better visibility on light or brown targets: particularly readable on cardboard silhouettes, steel targets, or urban backgrounds.
Reduced eye fatigue: more comfortable wavelength than pure red for long sessions.
2 MOA size: ideal compromise — fine enough for precise 100 m shots (~5.8 cm at 100 m), visible enough for CQB fast acquisition.

Use Cases & Context

Dynamic sport shooting: IPSC, USPSA, 3-Gun, PCC — compact + 22 mm window + green dot combination for fast acquisition.
Short/medium-range precision sport shooting: up to ~200 m, extendable with a Holosun HM3X or HM5X magnifier.
Semi-automatic rifle platforms: AR-15 in 5.56 NATO / .223 Rem, PCC in 9x19, .308 Win rifles — 1.63" co-witness mount suited.
Bolt-action / precision rifles: 1.05" low mount for Picatinny-rail bolt-action, hunting, Field Target sport.
Stand and stalking hunting: green dot particularly readable in forest environments or on variable-contrast targets. Compatible with big-game hunting when using appropriate .308 Win / 7.62 NATO caliber.
Service and patrol shooting (professional use): patrol rifle platforms — IP67 and 1000G suited to standard service constraints.
Modular configuration: universal T1/T2 footprint = wide choice of premium third-party mounts.
Comfortable alternative to red: for shooters sensitive to eye fatigue or evolving mainly in urban / range environments.

ARO CORE — GD, GR or MRS? Which to Choose?

The ARO CORE line comes in three versions:

ARO-CORE-GD-2: 2 MOA Gold dot (590 nm) — maximum contrast in bright environments, on vegetation or complex backgrounds.
ARO-CORE-GR-2 (this version): 2 MOA Green dot (540 nm) — maximum perceived brightness, prolonged visual comfort, ideal on light targets.
ARO-CORE-GR-MRS: green Multi-Reticle System (2 MOA / 65 MOA circle / Circle-Dot) — three reticles in one for maximum speed + precision versatility.

All three share the chassis, 22 mm window, T1/T2 footprint, side-loading CR2032, Shake Awake and included dual mount — the ecosystem remains coherent regardless of reticle choice.

Holosun Magnifier Compatibility

Holosun HM3X — 3x flip-to-side magnifier for range extension up to ~200-250 m
Holosun HM5X — 5x flip-to-side magnifier for range extension up to ~300-400 m