FPS video games -- scavenging ammo, realistic?

Extreme Personal Anecdote ON
Few years back at a family picnic in Pakistan, some cousins and I stuck a 2 by 4 into the ground and fired AK-47 rounds from 100 yards straight. All of us are failry experienced with guns-no experts though. Did’nt touch it. My Dad, who is an ex-army officer was busy sunning himself in a lawn chair perhaps a hundred yards to iur left. He looked amused and one of my cousins gave him his Ak and challenged him. Dad took the rifle, sat up, and shot the bloody thing with his first shot, and then told us to go off and stop ruining his nap. And from a man who was an artilleryman in an army whose main weapon is the G-3.

So yeah, I can see what you are saying

Extreme Personal Anecdote OFF

I asked my many extended family members who have seen action, one of them at a post in Kashmir where he was cut off and pounded for 6 weeks before being relieved and it was an eyeopener even he did not recall ever taking the dead enemys weapon in the heat of combat. Apparently the only thing he took was a Khurki from a dead Gurkha.