SPECIFICATION Gun weight, kg 4000 Rate of fire, shots/min 6-7 Crew, men 5 Transportation speed, km/h 67 SHOOTING TABLE Round Propellant charge, kg Weight of propellant, kg Muzzle velocity, m/s Range, m OF-420 "Old" full 4.46 720 17 450 #1 3.68 610 15 030 #2 2.90 510 12 800 OF-420 "New" full 4.46 737 18 300 #1 3.68 630 15 450 #2 2.9 520 13 000 B-420 Full 4.5 730 3 000 B-425 Full 4.5 730 3 000 Z-420 Full 4.5 737 11 400 ARMOR PENETRATION TABLE Round Angle Distance, m 100 300 500 1000 1500 2000 3000 B-420 60 111 108 106 99 92 86 75 90 137 133 130 121 113 106 92

Initially, the 107-mm M-60 Cannon was developed in two variants. The first one had a barrel which pulled off during transportation (to reduce the gun's dimensions) like the 107 mm Cannon Model 1910. The second variant had a barrel which turned round to the limber (to reduce the gun's dimensions also). The second variant was rejected however, because there were apprehensions of how to deploy a gun in the forest etc. As a result, the first variant of M-60 was accepted.

The M-60 has a separated loading ammo. As well as 122 mm Howitzer Model 1910/30, the M-60 has a piston lock. Its recoil system consist of hydraulic recoil brake and hydro-pneumatic reflexive mechanism. Recoil brake put inside the gun-crandle. Elevation mechanism had one sector which mounted onto the gun-crandle. The traversing mechanism was screw. Gun's wheels YaTB-4 taken from a trolley bus. The limber had a steel wheels with a rubber rims. The limber has nothing except winch. For transportation on short distances the gun's barrel didn't turned round and gun could be carried with speed up to 67 km/h.

Factory #172 had manufactured 4 experimental guns by the fall 1939. After the successful factory's trials, in December 13, 1939, two guns have been sent to the ANIOP's proving grouns (the first gun had normal rifling, the second one - deep rifling). Those trials consisted of 1633 shots and 1968-km race. The trials have showed the same results for both guns:

• Max range of a gun with normal rifling - 18 440 metres;
• Max range of a gun with deep rifling - 18 360 metres.

Accuracy of both gun was equal. Practice rate of fire 6-7 shots per minute. Trials revealed one serious drawback: the recoil brake worked unsatisfactorily.

From 11 to 25 October, 1940, after correction of that drawback, an experimental battery (consisted of two guns M-60) was sent to the army's trials which passed near Pushkin town. During that trials, the battery run 732-km race. The maximum speed (towed by an STZ-5 artillery tractor) on road - 18-20 km/h; on firm dirt road - 10-12 km/h; on muddy road or off road - 6-8 km/h. An attempt to tow gun by two crews was failed. It took 23 minutes to rotate gun on 180°.

According the conclusion of a special commission the 107 mm M-60 Cannon successfully passed all trials and was recommended for service. However, commission pointed to instability if fired with small elevation and unsatisfactory work of the gun's lock. Commission recommended to correct these disadvantages but according to archival documents they weren't.

Mass production of the M-60 gun was entrusted to the new Artillery Factory #352, in Novocherkassk. In 1940, the factory manufactured first 24 guns, in 1941 - another 103 guns. After the beginning of the Great Patriotic War, Novocherkassk was occupied by Germans and besides, in 1941-1942 Red Army had a small interest in that gun, thus manufacture of the M-60 was cancelled and never resumed in future.