From another thread. Yes I thought it was kooky too at first but think about it. They had sulphur, saltpetr and charcoal, the main ingridients of gunpowder. By the New Kingdom they had bronze, and the best guns were made from bronze until at least the Crimean war.
Granted when it was historically discovered, it was a thousand year until, it became more than a pyrotechnic, or used to propel arrows and in granades, to something like muskets and cannon. But a point....
If gunpowder is discoved in Egypt, an advanced society its perfectly possible they have the tools, and since in the New Kingdom era they were in almost continous wars, first as an expansionist entity, later to defend their holdings, still later against invaders, they have the necessary conditions needed for military innovation. So firstly
1) Do you think its possible. The Pharaohs musketmen?
2) If it is and lets say they develop the tech of roughly the 18th century, with its inevitable poliferation, how would it change history. Alexanders companion artillery anyone? The Thin Red Roman Line? The Bayonet charge of the Persian immortals?