GBRS Group® LERNA Mount / Aimpoint® Duty RDS™

The GBRS Group LERNA is a high-rise mount designed for Aimpoint Duty RDS and CompM5s red dot sights. It positions the optic's 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 ballistic 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 red dot 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.

For Aimpoint Duty RDS and CompM5s

This LERNA version is designed for the Aimpoint Duty RDS and is also compatible with the Aimpoint CompM5s. GBRS offers separate versions for other optic footprints, so the mount must be selected according to the specific model.

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 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.

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. 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 Aimpoint Duty RDS version weighs approximately 4.0 oz / 113 g. The package includes the LERNA mount, an extended T10 wrench, an extended 3/32" hex key, and a 1/4" T25 bit.

Made in the USA

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

Key Features:

• Designed for the Aimpoint Duty RDS
• Also compatible with the Aimpoint CompM5s
• 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-anodized finish
• 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
• Installation tools included
• Made in the USA