Task: Question Understanding
Input (English): Context : The Ross Mk.II (or ``model 1905'') rifle was highly successful in target shooting before WWI, but the close chamber tolerances, lack of primary extraction and overall length made the Mk.III (or ``1910'') Ross rifle unsuitable for the conditions of trench warfare and the often poor quality ammunition issued. 
Question : What year was the service entry date for Ross rifle?
Output (English): service entry