[1] Behind the torpedo tubes on the aft deck, in the port and starboard sides, are each one depth charge rack.

One of the boats was tested with a 57 mm AK-725 gun on the bow and received a modified project number – 205PE.

[4] The 4Ts-30-125 or later MR-220 (NATO reporting name "Peel Cone") radar is a shipboard air and surface search radar mounted on the mast with two antennas for the friend or foe identification system ("High Pole B").

The MR-104 ("Drum Tilt") fire-control radar is mounted on the rear of the superstructure for directing the fire of the two AK-230 guns.

[1] The Soviet Union classified the boats of their border troops as "border patrol ships" (Russian: ПСКР, romanized: PSKR, an initialism for пограничный сторожевой корабль, pogranichniy storozhevoy korabl')[5] and the four boats in the Navy as gunboats (Russian: артиллерийский катер).