the barrel consisted of liner, jacket and screwed-upon breech. early production barrels had a built-up construction, but in 1936 these were replaced in production by loose liner barrels. the breechblock was of interrupted screw type, similar in construction to that of the 152 mm howitzer m1910/37. unlike early prototypes, productional barrels did not have muzzle brake. recoil system consisted of hydraulic recoil buffer and hydro-pneumatic recuperator, both located inside the cradle under the barrel.