21. The only major design difference between the 57 and 75 that would emerge was the recoil system . 22. Tom's invention is similar to the recoil system used in the French 75mm field gun. 23. The Type 4 is the first Japanese weapon to replace the hydrospring recoil system with the hydropneumatic. 24. Furthermore, it used the a variable recoil system that shortened the recoil as the elevation increased. 25. The usual recoil system in modern quick-firing guns is the hydro-pneumatic recoil system. 26. The usual recoil system in modern quick-firing guns is the hydro-pneumatic recoil system . 27. Gun models included both older fixed carriage guns and more modern weapons with counter-recoil systems . 28. The American version, the M256, uses a coil spring recoil system instead of a hydraulic system. 29. Firing the guns tended to jam the turret until modifications were made to the guns'recoil system . 30. Distinctive features of the D-30 include its low mobile mounting and above-barrel recoil system .
