American Defense Trijicon MRO LW QR Lower 1/3 Co-Witness Mount - Precision Optics Solution

The American Defense Trijicon MRO LW QR Lower 1/3 Co-Witness Mount delivers a lighter, cleaner setup for shooters running the Trijicon Miniature Rifle Optic on AR platforms and other Picatinny rails. This precision-engineered mount shaves 20% off the weight of traditional alternatives while opening up your sight picture for better target awareness—a real advantage whether you're at the range, hunting, or training. Built from 6061-T6 aluminum and finished in hard coat mil-spec anodize, it's designed to handle serious use without breaking down.

What sets this mount apart is the Patented QD Auto Lock Lever system, which grips both in-spec and out-of-spec rail systems with equal authority. No proprietary tools needed—adjust the clamp with your finger or a flat-blade screwdriver, and configure the lever to lock forward or rearward depending on your setup. The clamping surface is engineered to maximize rail contact and hold zero through hard shooting.

If you're building a lightweight MRO setup or just want to trim ounces without sacrificing repeatability, this mount earns its place on your upper receiver.

Key Features

• 20% weight reduction compared to standard MRO mounts
• Patented QD Auto Lock Lever system accommodates in-spec and out-of-spec rail systems
• Lower 1/3 co-witness height for consistent sight picture with backup iron sights
• Precision-machined 6061-T6 aluminum construction
• Hard coat mil-spec anodize finish for durability and corrosion resistance
• Tool-free adjustment—use your finger or a flat-blade screwdriver
• Lever can be configured to lock forward or rearward
• Superior clamping surface for maximum rail engagement

Specifications

Frequently Asked Questions

What optics does this mount work with?

This mount is designed specifically for the Trijicon Miniature Rifle Optic (MRO). It will not fit other optic models.

Will this mount work with both in-spec and out-of-spec rails?

Yes. The Patented QD Auto Lock Lever system is engineered to clamp securely on both in-spec and out-of-spec Picatinny rails, giving you flexibility across different upper receivers and rail systems.

Do I need special tools to adjust or remove this mount?

No. The QD lever can be adjusted with your finger or a flat-blade screwdriver—no proprietary tools required. The lever can also be configured to lock to either the front or rear, depending on your preference.

What height is the co-witness on this mount?

This is a lower 1/3 co-witness mount, which positions your MRO to align with the top third of standard backup iron sights for a clean, practical sight picture.