I would imagine that some soldiers would gladly throw away their own weapons for a better one looted from a foe, but what problems did that cause logistically? If not, what was done with all the captured guns?
This was answered very well in this thread here: https://www.reddit.com/r/AskHistorians/comments/3v89s9/did_soldiers_pick_up_the_weapons_of_dead_enemies/