Quote Originally Posted by Warsaw View Post
Advances speed up in areas that need them. For a service rifle, you aren't going to ditch your entire setup for a new gun when your current one works just fine for killing your enemy. Case in point, the Lee-Enfield; the Brits intended to replace it with a new rifle just before the First World War, but because they entered the war (), they couldn't do that. They needed to equip their men right then and there.
20 year's is a long stretch by anyones imagination.
And im pretty sure by the point of reach their going to be desparate and so will have long implemented the prototypes, even if its because they've run out of resources to keep repopulating old ammunition.