The GR-1004, which is based on the GR-1000, is designed to attach to the side of a Picatinny rail. The GR-1004 features an updated geometry of the ballistic bow, which allows for the use of larger accessories on the side mounted Picatinny interface and is calibrated for use with the NATO low velocity M433 HE round. The ballistic bow has range settings from 50 to 350 meters. The rear of the ballistic bow has tritium inserts for 100, 200, and 300 meters.
* Optic not included