Serbia's D-30/04 Samokhodno ORudye Artilerii (SORA) 122 mm self-propelled howitzer (SPH).

Self-propelled howitzer 122mm SORA is intended for general fire support of brigade level units. It has been designed to fulfill requirements of the modern battlefield, which means that shoot-and-scoot principle is adopted as the main mode of operation.

Self-propelled howitzer SORA features whole upper part of 122mm howitzer D-30J mounted on the rear end of modified FAP 2026 BS/AV truck chassis. Main functions of the weapon system, such as navigation, gun lying, automatic loading of ammunition and deployment, are fully automatic.

The project, which began in 2004 (hence the '04' in its designation), is being undertaken in three phases by the Serbian military technical institute VTI (Vojnotehnicki Institut), responding to requirements set out by the Serbian Ministry of Defence's Planning and Development Directorate.

During the first phase the VTI designers undertook studies and embarked on the construction of a functional model of the weapon. After its March roll-out, it underwent a series of initial firing trials, involving about 18 rounds, the first three of which were conducted with reduced charges and the remainder with full charges.

Improvements were subsequently made to the stabilisation system, whose forward-facing stabilisers proved unable to adequately absorb the recoil forces during firing. Another goal was to demonstrate loading of the weapon at all elevation angles, and this was successfully achieved, according to VTI.