28 (Cannon model 1928) was a Czech field gun used during World War II.

28 combined a two-wheeled box trail carriage, horizontal sliding wedge breech, hydro-pneumatic recoil system, high angle elevation and a firing table[clarification needed] for 360° degree traverse.

Notably, for the first time among field guns it featured a muzzle brake, one of the designs by company's engineer Bohdan Pantoflíček patented[3] in 1927.

For the mountain gun role it could be broken down into three pieces for transport, a feature also shared by the contemporary 10 cm houfnice vz.

Guns captured from Yugoslavia by the Germans were given the designation 7.65 cm FK 304(j).