Holosun IRIS GR1 vs GR2 vs GR3 vs GR4: Complete 2026 Buyer’s Guide
The Holosun IRIS series has rapidly become one of the most popular civilian-legal laser aiming modules (LAMs) on the market. Built from redesigned 7075-T6 aluminum housings that are significantly lighter, lower, and narrower than Holosun’s older LS-series units, the IRIS lineup offers a clear progression of capability—from a simple single-laser pointer all the way up to a true quad-function system that includes a powerful white light.
This guide focuses on the green-laser (“GR”) versions: IRIS-GR1, IRIS-GR2, IRIS-GR3, and IRIS-GR4. All models feature co-aligned lasers where applicable, ambidextrous center fire buttons, rear mode selectors, Crane-style remote switches, IPX8 waterproofing, and 0.5 MOA adjustments with ±50 MOA travel. They are Class 1 (or equivalent) for the IR components and fully legal for U.S. civilian ownership (subject to normal ITAR restrictions).
Quick Comparison Table
A side-by-side overview of the key differences before diving into the detailed reviews.
| Model | Approx. Street Price | Functions | Weight (approx.) | Battery | Key Strength | Best For |
|---|---|---|---|---|---|---|
| IRIS-GR1 | $255–$300 | Visible green laser only | 4.6 oz | AA | Ultra-light & simple | Daytime training / minimalist builds |
| IRIS-GR2 | $425–$500 | Visible green + IR laser | 5.0–5.2 oz | CR123A | Day/night aiming without illuminator | Users who already have IR illumination |
| IRIS-GR3 | $899–$950 | Visible green + IR laser + 60 mW VCSEL IR illuminator | 6.4 oz | CR123A | Best overall value for NV | Most night-vision users |
| IRIS-GR4 | $999–$1,050 | Visible green + IR laser + 60 mW VCSEL IR illuminator + 1,000 lm / 25,000 cd white light | 8.5 oz | 2× CR123A or 18650 | True all-in-one capability | SBR/PDW or rail-space-limited builds |
1. Holosun IRIS-GR1 — Lightest & Simplest
The IRIS-GR1 is a single-function visible green laser (Class 3R, <5 mW, 520 nm). Holosun redesigned the 7075-T6 aluminum housing to be 33 % lighter and 20 % lower-profile than the older LS117 series. It features a top-mounted ambidextrous fire button (momentary or constant-on), a rear power/mode selector (high/low), and ships with a single-button Crane-style remote pressure pad.
Powered by a single AA battery, the unit weighs only 4.6 oz and measures roughly 3.4 × 1.6 × 1.2 inches. There is also an IR-only version (IRIS-IR1) and a red-laser version (IRIS-RD1) if green is not preferred.
- Extremely lightweight and compact
- Lowest price in the IRIS lineup
- Simple high/low controls
- Excellent for pure daytime or training use
- AA battery is cheap and widely available
- No IR laser or illuminator
- Limited utility under night vision
- Single-function only
2. Holosun IRIS-GR2 — Day + Night Aiming Combo
The IRIS-GR2 adds a Class 1 IR aiming laser (0.7 mW VCSEL) that is co-aligned with the visible green laser. Zero the green laser in daylight and the IR laser is already zeroed for night-vision use. The housing is 45 % lighter and 21 % lower than the previous LS221 series.
Controls remain simple: center fire button for momentary/constant-on, rear selector for visible or IR (high/low), and a compact single-button Crane remote. Weight is approximately 5.0–5.2 oz on a single CR123A. Dimensions are roughly 3.2 × 1.85 × 1.3 inches.
- Co-aligned visible + IR lasers
- Still very light and low-profile
- Excellent value for day/night aiming
- VCSEL IR laser produces a clean beam
- Ideal if you already own a separate IR illuminator
- No IR illuminator
- Requires ambient light or a separate illuminator for full NV performance
3. Holosun IRIS-GR3 — Best Overall Value for Night Vision
The IRIS-GR3 is the model most people mean when they simply say “Holosun IRIS.” It is a true triple-function device: co-aligned visible green laser, Class 1 IR laser, and a 60 mW VCSEL IR illuminator with a top-mounted slider that adjusts beam divergence from wide flood (~15–150 mrad) to tight spot.
The redesigned 7075-T6 housing is 43 % lighter and 20 % lower than the older LS321 series. Weight is 6.4 oz with a single CR123A. Controls include an ambidextrous center fire button, dual rear selectors for mode and intensity, and a dual-button remote with VIS override. Size is approximately 3.2 × 1.97 × 1.34 inches.
Real-world feedback consistently praises the clean, MAWL-like VCSEL beam quality at a fraction of the cost of premium units.
- Outstanding performance-to-price ratio
- Clean, adjustable 60 mW VCSEL illuminator
- Co-aligned lasers make zeroing effortless
- Compact and relatively lightweight
- Excellent remote switch with VIS override
- Proven durability under recoil
- No white light
- Illuminator power is solid but not the absolute strongest at extreme ranges
- Still more expensive than pure laser-only units
4. Holosun IRIS-GR4 — True All-in-One Solution
The IRIS-GR4 takes everything from the GR3 and adds a high-output white light: 1,000 lumens / 25,000 candela. The same 60 mW VCSEL IR illuminator and co-aligned green/IR lasers remain, now joined by independent fire buttons for lasers versus white light and a three-button remote with VIS override.
The housing is further refined—43 % lighter, 29 % lower, and 28 % narrower than the previous LS420 series. Weight rises to 8.5 oz, powered by either two CR123A batteries or a single 18650. Approximate dimensions are 4.2 × 2.3 × 1.4 inches. The top-mounted slider adjusts both the IR illuminator and (to a degree) the white-light beam pattern.
For many users the extra ~$100 over the GR3 effectively replaces a dedicated weapon light, making the GR4 one of the strongest value propositions in the entire civilian LAM market.
- Genuine four-function capability in one unit
- Strong 1,000 lm / 25,000 cd white light
- Same excellent VCSEL IR illuminator as the GR3
- Saves rail space and weight versus separate light + laser
- Independent activation for light and lasers
- Still under $1,100 street price
- Heavier than the GR3
- Slightly bulkier form factor
- White light, while good, is not quite as optimized as a dedicated high-candela light
Quick Buying Advice
- Just need a visible laser for daytime or training → IRIS-GR1
- Want day + night aiming but already have (or plan to buy) a separate IR illuminator → IRIS-GR2
- Best overall choice for most night-vision users → IRIS-GR3
- Want everything in one package (especially on an SBR or limited-rail rifle) → IRIS-GR4
All four models share the same excellent build quality, co-alignment philosophy, and Holosun’s aggressive price-to-performance approach. The jump from GR2 to GR3 is the most significant for pure night-vision work; the jump from GR3 to GR4 is primarily about convenience and white-light capability.
Frequently Asked Questions
Are the Holosun IRIS models civilian-legal?
Yes. All IR components are Class 1 (or equivalent) eye-safe versions designed to comply with FDA regulations. They are ITAR-controlled and may only be sold to U.S. persons, but they are fully legal for civilian ownership and use.
What does the “GR” designation mean?
GR indicates a green visible laser. Holosun also offers RD (red visible laser) versions of most models and an IR-only version of the single-laser unit (IRIS-IR1).
How good is the 60 mW VCSEL illuminator on the GR3 and GR4?
Very good for the price. Users consistently describe the beam as clean and “MAWL-like” at closer-to-mid ranges. It is not the absolute strongest illuminator available, but it is more than adequate for most civilian night-vision applications out to several hundred yards when focused.
Do the lasers stay zeroed under recoil?
Yes. Real-world feedback on AR-pattern rifles and similar platforms has been strongly positive. The 7075-T6 aluminum housing and solid mounting system hold zero well.
Is the white light on the GR4 actually usable?
Yes. At 1,000 lumens and 25,000 candela it provides effective illumination out to roughly 300 meters for identification purposes and is more than sufficient for most defensive or home-defense distances. It is not quite as specialized as a dedicated high-candela light, but the convenience of having it integrated is significant.
Can I run a separate remote switch?
All models use standard Crane-style plugs, so aftermarket dual- or triple-button switches from Arisaka, Unity, and others are compatible.
Which model should I buy if this is my first IR laser/illuminator?
Most first-time night-vision users should start with the IRIS-GR3. It delivers the complete aiming + illumination package at a price that remains highly competitive. If rail space or the desire for a built-in white light is a priority, step up to the GR4 for only about $100 more.
Prices and availability change frequently. Always verify you are purchasing the current civilian version from an authorized dealer. This article is for informational purposes only and does not constitute legal advice.