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from wikipedia https://en.wikipedia.org/wiki/Mitsubishi_G4M

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G4M1

G4M1 prototypes
    (Mitsubishi Navy Type 1 attack bomber) / (Mitsubishi Navy Experimental 12-Shi land attacker). Two prototypes built.

G4M1 Model 11
    (Mitsubishi Navy Type 1 Attack Bomber Model 11). The first bomber model of series, with 1,140 kW (1,530 hp) Mitsubishi MK4A "Kasei" Model 11 engines driving three-blade propellers. The following modifications were made during production:

    March 1942: the first aircraft (241st production example) fitted with [Mitsubishi Kasei|[Mitsubishi MK4E "Kasei" Model 15]] engines with larger superchargers for better high altitude performance, became standard in August 1942 from 406th aircraft onwards. These MK4E-engined aircraft have often (erroneously) been referred as the "G4M1 Model 12".
   
 Summer 1942: propeller spinners introduced
   
 March 1943: from 663rd machine onwards, 30 mm (1.181 in) rubber ply sheets installed beneath the wing outer surfaces to protect the underside of the fuel tanks (speed reduced by 9 km/h (4.9 kn; 5.6 mph) and range by 315 km (170 nmi; 196 mi), 5 mm (0.197 in) armour plates added into tail gunner's compartment.
   
 Spring 1943: outer half of the tail cone cut away in order to improve tail gunner's field of fire.
   
 August 1943: a completely redesigned tail cone, with reduced framing and wide V-shaped cut out; this form of tail cone was also used in all G4M2 models.
   
 September 1943: individual exhaust stacks from 954th airframe onwards

Production of the G4M1 ended in January 1944.

G4M2
The first of the four G4M2 prototypes flew in December 1942 (Mitsubishi Navy Type 1 Attack Bomber Model 22). It differed from the preceding model in having Mitsubishi MK4P "Kasei" Model 21 engines with VDM electric four-blade propellers capable of full feathering function, redesigned main wings with LB type laminar flow airfoil.[N 1] and widened tail horizontal stabilizer wing area, which improved service ceiling to 8,950 m (29,360 ft) and maximum speed to 437 km/h (236 kn; 272 mph). Main wing fuel tanks were enlarged to 6,490 l (1,710 US gal; 1,430 imp gal) which increased the range to 6,000 km (3,200 nmi; 3,700 mi) (overloaded, one way). An electrically powered dorsal turret featuring a 20 mm (0.787 in) Type 99 cannon was introduced in place of G4M1's dorsal position with a 7.7 mm (0.303 in) Type 92 machine gun, total guns armed were two 20 mm (0.787 in) Type 99 cannons (one tail turret, one top turret), and four 7.7 mm (0.303 in) Type 92 machine guns (one nose, two waist, and one cockpit side). External differences also included increased nose glazing, flush side gun positions instead of blisters, and rounded tips of wings and tail surfaces. These major improvements also made it possible for the G4M2 to carry more powerful bombs; one 1,055 kg (2,326 lb) Navy Type 91 Kai-7 aerial torpedo or one 800 kg (1,800 lb) bomb or two 500 kg (1,100 lb) bombs or one 800 kg (1,800 lb) Type 3 No. 31 bomb (ray-detective type bomb) and twelve 60 kg (130 lb) bombs. The G4M2 entered service in mid-1943.

G4M2 Model 22
    (Mitsubishi Navy Type 1 Attack Bomber Model 22) the base model, the first production example completed in July 1943. Introduced bulged bomb bay doors from 65th aircraft onwards, and an optically flat panel in the nose cone from the 105th aircraft onwards.

G4M2 Model 22Ko
    (Mitsubishi Navy Type 1 Attack Bomber Model 22 Ko) very similar to previous model. Carried Type 3 Ku Mark 6 search radar and was armed with 20 mm (0.787 in) Type 99 Model 1 cannon s replacing the 7.7 mm (0.303 in) Type 92 machine guns in the lateral positions.

G4M2 Model 22 Otsu
    (Mitsubishi Navy Type 1 Attack Bomber Model 22 Otsu) dorsal turret cannon changed to longer-barreled 20 mm (0.787 in) Type 99 Model 2 cannon.

G4M2a Model 24
    (Mitsubishi Navy Type 1 Attack Bomber Model 24) modified Model 22, Mitsubishi MK4T Kasei 25 1,340 kW (1,800 hp) engines, with bulged bomb bay doors as standard for larger bomb capacity. Externally distinguishable from the Model 22 by a carburetor air intake on the top of the engine cowling.

G4M2a Model 24 Ko
    (Mitsubishi Navy Type 1 Attack Bomber Model 24 Ko) armament similar to Model 22 Ko.

G4M2a Model 24 Otsu
    (Mitsubishi Navy Type 1 Attack Bomber Model 24 Otsu) armament similar to Model 22 Otsu.

G4M2a Model 24 Hei
    (Mitsubishi Navy Type 1 Attack Bomber Model 24 Hei) modified 24 Otsu, with one 13.2 mm (0.520 in) Type 2 machine gun mounted in tip of the nose cone, radar antenna relocated from that position to above the nose cone.

G4M2b Model 25
    (Mitsubishi Navy Type 1 Attack Bomber Model 25) one G4M2a modified to Mitsubishi MK4T-B Kasei 25 Otsu 1,360 kW (1,820 hp) engines. Only experimental.

G4M2c Model 26
    (Mitsubishi Navy Type 1 Attack Bomber Model 26) two G4M2as modified to Mitsubishi MK4T-B Ru Kasei 25b 1,360 kW (1,820 hp) engines with turbochargers.

G4M2d Model 27
    (Mitsubishi Navy Type 1 Attack Bomber Model 27) one G4M2 modified to Mitsubishi MK4V Kasei 27 1,340 kW (1,800 hp) engines.

G4M2e Model 24 Tei
    (Mitsubishi Navy Type 1 Attack Bomber Model 24 Tei) special version for the transport of the ramming attack bomb plane Kugisho/Yokosuka MXY-7 Ohka ("Baka") Model 11, conversions of G4M2a Model 24 Otsu and 24 Hei. Had armour protection for the pilots and fuselage fuel tanks.
MXY11 (Yokosuka Navy Type 1 attack bomber ground decoy)
    ground decoy non-flying replica of Mitsubishi G4M2 developed by Yokosuka

G4M3

G4M3 Model 34
    (Mitsubishi Navy Type 1 Attack Bomber Model 34 Tei) redesigned G4M2 with added self-sealing fuel tanks, improved armor protection and an entirely new tail gunner's compartment similar to that of late model B-26 Marauders. Wings were also redesigned and the horizontal tailplane was given dihedral. Armed with two 7.7 mm (0.303 in) Type 92 machine guns in nose cabin and in both side positions, and one 20 mm (0.787 in) Type 99 Model 1 cannon in dorsal turret and tail. Entered production in October 1944 in G4M3a Model 34 Ko form with 20 mm (0.787 in) Type 99 cannon in side positions instead of machine guns.

G4M3a Model 34 Hei
    (Mitsubishi Navy Type 1 Attack Bomber Model 34 Hei) similar modifications as in corresponding Model 24 variants.

G4M3a Model 34 Otsu
    (Mitsubishi Navy Type 1 Attack Bomber Model 34 Otsu) similar modifications as in corresponding Model 24 variants.

G4M3 Model 36
    (Mitsubishi Navy Type 1 Attack Bomber Model 36) prototype. Two G4M2 Model 34 modified to Mitsubishi MK4-T Kasei 25b Ru 1,360 kW (1,820 hp) engines.

G6M1

G6M1
    (Mitsubishi Navy Type 1 wingtip convoy fighter) initial model of the series, armed with three 20 mm (0.787 in) Type 99 cannon (two in a belly blister, one in the tail) and one 7.7 mm (0.303 in) Type 92 machine gun in the nose; 30 built.

G6M1-K
    (Mitsubishi Navy Type 1 large land trainer) trainers converted from G6M1s.

G6M1-L2
    (Mitsubishi Navy Type 1 transport) G6M1s modified as transports.
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