GBRS Group® LERNA Mount / EOTech® EXPS

The GBRS Group LERNA is a high-rise mount designed for EOTech EXPS holographic sights. It positions the sight's optical axis 2.91" / approximately 73.9 mm above the mounting rail. The elevated position supports a more upright head posture and can make the optic easier to use with a helmet, communications headset, protective mask, or night vision device. The design follows the same elevated-optic concept as the GBRS HYDRA but omits the front accessory platform.

2.91" Optical Axis Height

The LERNA positions the EOTech EXPS sight'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 natural heads-up aiming position.

Designed for EOTech EXPS Sights

This LERNA version is specifically designed for EOTech EXPS holographic sights. GBRS also offers separate versions for EOTech XPS sights and other optic configurations, so the mount must be selected according to the specific model.

HYDRA-Based Design without a Front Platform

The LERNA uses the same basic high-rise optic concept as the GBRS HYDRA system but omits the front platform for additional accessories. Its streamlined construction is focused exclusively on mounting the primary optic.

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.

6061-T6 Aluminum 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.

Weight and Package Contents

The EOTech EXPS version weighs approximately 4.0 oz / 113 g. The package includes the LERNA mount and a 1/4" T25 bit for installation.

Made in the USA

The mount is designed, manufactured, and assembled in the United States.

Key Features:

• Designed for EOTech EXPS holographic sights
• Optical axis height of 2.91" / approximately 73.9 mm
• Supports a natural heads-up aiming 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 4.0 oz / 113 g
• 1/4" T25 installation bit included
• Made in the USA