Product Overview
The SIG Sauer ROMEO4 is a red dot sight with 1x magnification and a 20mm objective lens. Its Red Dot reticle helps define the aiming system.
Compatibility and Mounting
Compatibility depends on the exact firearm, receiver, rail standard, optic footprint, tube diameter, ring height, and mounting hardware. Verify all dimensions and manufacturer fitment information before ordering.
Key Features
- Magnification: 1x
- Objective Lens: 20mm
- Reticle: Red Dot
- Dot Size: 5 MOA
Why These Features Matter
Magnification: 1x
Magnification determines the apparent size of the target and affects field of view, speed, and practical engagement distance.
Objective Lens: 20mm
Objective diameter affects light transmission, mounting height, weight, and the optic’s overall profile.
Reticle: Red Dot
Reticle design affects aiming speed, holdovers, ranging, and how easily the sight picture can be read.
Dot Size: 5 MOA
A smaller dot supports more precise aiming, while a larger dot is generally faster to acquire at close range.
Best For
- Fast target acquisition and close-to-intermediate range use
- Handgun, rifle, or shotgun setups with a compatible mounting system
- Customers who verify exact product and firearm compatibility before ordering
TRA Take
The right optic or mount should be selected around the firearm, shooting distance, target size, lighting conditions, mounting system, and the shooter’s preferred sight picture. For close-range sights, dot or reticle size, emitter design, battery access, mounting footprint, and co-witness height are the most important comparisons.
Frequently Asked Questions
What type of optic product is this?
This item is classified as a red dot sight.
What is the magnification?
The listed magnification is 1x with a 20mm objective lens.
Does this product require shipment to an FFL?
No. Standard optics, mounts, rings, rangefinders, lasers, and accessories generally ship directly where legal.
What is the manufacturer part number?
The manufacturer part number is SOR43022.
Shipping and Installation Information
Standard optics and mounting products generally ship directly where legal. Professional installation may be appropriate for firearm-specific bases, mounts, rings, lasers, or adapter plates. Follow manufacturer torque, thread-locking, mounting, and zeroing instructions.
Why Buy From Tar River Arms
- Veteran-owned licensed firearms dealer
- Secure online checkout
- Nationwide shipping where legal
- Local pickup available in Raleigh, North Carolina
- Professional product-support and gunsmithing experience
Product Identification
Manufacturer Part Number: SOR43022
UPC: 798681567874