The original Grenade Launcher Sight Mount, designed to attach to the side of an HK GLM. Designed to be used with HE low velocity munitions, the GR-1000 has a ballistic bow with range settings from 50 to 350 meters. The rear of the ballistic bow has tritium inserts for 100, 200, and 300 meters.
The GR-series effectively shortens the length of training needed to become proficient with the 40mm system, while at the same time providing cost savings as fewer grenades will be needed to complete training.
*Optic not included