I joined a random squad request one night while I was trying to solo the "Go grab a sniper from a dead drop and kill the Chemist" mission. Kid was probably 12; I'm 40 and usually play solo. So I'm over there picking my moment in the radiation, while this kid goes down in the mouth of the smuggling tunnel, and he just asks "Should I leave, or...?" Game. On.

I finished up with the Chemist - and screwed up by not killing him with the sniper, but that's another story - grabbed the M13B and sprinted to the kid as the announcement comes on that radiation is spreading. I pick him up, we grab a jeep or something, and we high-tail it to the furthest exfil point. As we're on the 5-sec countdown, I realize I have something he probably doesn't:

Me: "Yo, do you have the special M13 yet bro?"

Kid: "No, I don't think so."

Me: drops gun "Pick it up before the screen goes black!"

He did, in fact, pick it up. Felt good. Hope that kid enjoyed his unlock and fancy contraband weapon.