Grenade launcher optical sight (1OP19-3) The PGO-7V (1OP19-1), PGO-7V2 (1OP19-2), PGO-7V3 (1OP19-3) grenade launcher optical sights are designed for mounting on grenade launchers and used for battlefield surveillance and aiming the grenade launcher at the target when firing against fixed and moving targets. Different sight versions ...