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The NA61/SHINE collaboration measured inclusive cross sections of \pi^+ and\pi^- meson production in the interactions of 31 GeV/c protons with carbonnuclei at forward emission angles (0 - 420 mrad). The collaboration alsopresented predictions of Monte Carlo models - FLUKA, VENUS and UrQMD, incomparison with the data. A careful analysis shows that deviations of the FLUKAand VENUS predictions from the data have different tendencies. The worstdescription of the data was observed for the UrQMD model results.  All the models assume the creation of quark-gluon strings in theinteractions, but it is complicated to analyze the models in order to find thesource of the deviations. Thus, the quark-gluon string model - FRITIOF (FTF) -was implemented in the GEANT4 toolkit and is used to understand the deviationsmentioned above. It was found that the most important factor influencing theFTF calculations is the sampling of quark-gluon string masses. The otherfactors/parameters are not essential for a description of the data. Also, agood description of the data is achieved by the FTF model.

Tuning of the GEANT4 FRITIOF (FTF) Model Using NA61/SHINE Experimental Data