MiG-15 bis / SO 21

In addition to its usual armament suite, the experimental SD-21 was fit­ted with two wing store stations for 210-mm S-21 unguided air-to-sur – face rockets. This same prototype was tested in overload conditions with two S-21 rockets and two 250-1 (66-US gallon) drop tanks.

MG-15 bis / SD-57

This modified production MiG-15 bis was developed for tests of two automatic rocket pods (each carrying twelve 57-mm ARS-57 rockets), which were attached to the store stations usually reserved for drop tanks.

MiG-15 bis / ISh

This version of the MiG-15 bis was equipped with two wing pylons that could accept either heavy rockets, automatic rocket pods (six or twelve rockets per pod), or drop tanks. Twelve of these planes were built and flight-tested at the Nil WS.