The RPG-4 is a Soviet rocket launcher.
The RPG-4 was developed from the RPG-150 rocket launcher. Adoption of the RPG-4 was planned, but in 1961, the RPG-7 entered service. The RPG-7 proved to be superior to the RPG-4, and work on the RPG-4 was halted indefinitely.
The RPG-4 looks similar to the famed RPG-7, but is shorter and has 1 pistol grip instead of 2.
The RPG-4 uses the PG-150 rocket from the RPG-150.