The late, long-nosed version of MiG-3 replaced the early version on production line during the late summer of 1941, probably in August; it is predominant over the late version in photos taken after the late autumn 1941.
The late MiG-3 version is easily distinguishable in photos from early short-nosed version  via the first exhaust pipe, which is covered by a cowling, by long gun barrel covers over the nose, and from thin triangular plates on the outlets of side oil radiators.
The radio set presence can be usually recognized from the visible radio mast and wires, but some examples show no radio boxes protruding under the canopy even if they have the mast and wires.
Usually the MiG-3s were flown with  the sliding part of the canopy opened (or, sometimes, removed), because of radiator heat and gas infiltrations from the engine, and the fear to be imprisoned if the aircraft should be shot down; in fact, the canopy was hard to slide at flying speeds above 400 km/h.
The rockets, set on triple launchers 3ROB-82, can be used both against ground targets and air targets during bomber interception.
They are regularly used since winter 1941/42, particularly in the Moscow area.
The tail wheel doors are usually bulged, but there is some exception to this rule. The tail wheel retraction mechanism was subject to malfunctions, so it was often locked in open position on the late examples; the doors were replaced by a canvas cover with various shapes.
The slats were usually present on late examples; there are some exceptions to this rule. The closed flaps are difficult to see on photos, but their presence is recognizable from the underwing pitot probe, while their absence is associated with a leading edge mounted one.

from Barbarossa victims

This example, captured by the Germans, features the "za rodinu" ("for homeland") inscription on its side. If the photo was taken during the summer 1941, it could be one of the first documented late model MiG-3s; its tail wheel doors are still of the early style. Being without its engine cowling, its identification as a late version is due to the first exhaust stack cowling, the space behind the last stack and the triangular plates behind the oil radiator. Note the deletion of the star on the tail.

These  aircrafts are flying over Moscow, probably during the spring of 1942. Note the underwing rockets, the fixed tail wheels and the opened canopies. The camo is green and black.

Above:  An aircraft with the slogan "Smert nemetskim okkupantam!" (death to the German occupants!).  The aircraft has thin outline around the stars.  from Red Stars     Left:  Here is another shot of the same aircraft. On the background is visible another aircraft, probably yellow 4.  The camo scheme, alòthough unclear, looks similar to that of the previous aircraft. Note the partially white spinner.  from "Unknown battles on the Moscow skies" of Hazanov

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