The ex Austro-Hungarian 77/28 piece was already from 1938 intended for use only in the colony (AS and AOI). The reason had been dictated not only by the already considerable number that was present in the two war chessboards but also by the simplicity of use for the native and Libyan troops framed by the Italians and by the fact that by doing so the ammunition system would have been simplified. In addition, it was an easily transportable piece that made him choose for that too. as far as the 100/17 piece is concerned, however, it must be said that the production of the 105/28 would never have been able to satisfy the needs of all the infantry divisions and therefore only one Corps piece remained for the whole war Furthermore, the existing pieces with bronze barrels (which however were not the total) were mostly retubed or even in the years before the war the barrels were replaced as well as the towing carriages and sometimes wheels and pointing systems. However, the fact remains that the Italian divisional artillery was certainly inferior to the German and American artillery throughout the war and partially, at least for the first phase of the conflict, than the British.
all the best
Maurizio