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What if the major powers in WW1 had been able to field practical SMG designs by 1915 for ground forces to use in trench warfare? It seems remarkable that none really were able to before 1918 and even then only in tiny numbers overall. What if the various militaries had been more on the ball and developed something like the MP18 or Villar Perosa with either top or side mounted straight magazines (not snail drums)? Or perhaps the Hellriegel M1915 is simplified and used magazines instead of a drum and is widely issued? What impact would that have on trench fighting and tactics if such a weapon was standard and pretty widely available by 1916-17? Would it change the general post-war evolution of infantry weapons, doctrine, and tactics?