GBRS Group® LERNA Mount / Trijicon MRO®

The GBRS Group LERNA is a high-rise mount designed for the Trijicon MRO red dot sight. It positions the optic's axis 2.91" / approximately 73.9 mm above the top surface of the mounting rail. The elevated position supports a more upright head posture and can make the optic easier to use with a ballistic helmet, communications headset, protective mask, or night vision device. The 6061-T6 aluminum body is complemented by clamping hardware made from 17-4 PH stainless steel.

2.91" Optical Axis Height

The LERNA positions the Trijicon MRO's optical axis 2.91" / approximately 73.9 mm above the top surface of the mounting rail. This reduces the need to lower the head toward the stock and supports a more upright aiming position.

Designed for the Trijicon MRO

This LERNA version features a mounting interface specifically designed for the Trijicon MRO. GBRS offers the same high-rise concept for other optic footprints, but each version uses a dedicated mounting interface.

More Clearance for Head-Mounted Equipment

The elevated optic position is particularly useful when wearing equipment around the head and face. It can make aiming easier when using a ballistic helmet, communications headset, protective mask, or night vision device.

HYDRA-Based Design without a Front Platform

The LERNA is based on the elevated-optic concept of the GBRS HYDRA system but omits the front accessory platform. Its more streamlined construction is focused exclusively on mounting the primary optic.

Aluminum Body and Steel Hardware

The mount body is machined from 6061-T6 aluminum and protected by a Type III Class 2 hard-anodized finish compliant with MIL-A-8625. The clamping bar and screws are made from 17-4 PH stainless steel in H900 condition and feature a Melonite QPQ finish. The washers are made from 18-8 stainless steel. The Trijicon MRO version weighs approximately 122 g.

Installation Tools Included

The package includes an extended T10 wrench, an extended 3/32" hex key, and a 1/4" T25 bit for installing the mount and optic.

Key Features:

• Designed for the Trijicon MRO red dot sight
• Optical axis height of 2.91" / approximately 73.9 mm
• Supports a more upright head position
• Suitable for use with helmets, headsets, protective masks, and night vision devices
• Based on the GBRS HYDRA mounting concept
• Streamlined design without a front accessory platform
• 6061-T6 aluminum body
• Type III Class 2 hard anodizing compliant with MIL-A-8625
• 17-4 PH H900 stainless steel clamping bar and screws
• Melonite QPQ finish on the clamping hardware
• 18-8 stainless steel washers
• Weight of approximately 122 g
• Installation tools included