OPTIC INTERFACE SYSTEM MODEL: RB4001 or RB4006 The RB4001 is an optic interface system designed specifically for SL1 & GL1 projectile launchers. It accepts a variety of sights, including but not limited to the following: EOTech®, ProPoint®, Trijicon® ACOG® & Reflex, C-More®, or Aimport®. The system includes the interface system and all of the necessary hardware required for mounting. DOES NOT CO-WITNESS. The RB4006 is designed specifically for SL6 and GL6 projectile launchers. DOES NOT CO-WITNESS.