Hello Vicarov,
It was me, I exchanged a smartgunner his smartgun and ammo for an M60 with the drum in the mag-well and no extra ammunition during hijack.
I don’t remember who I gave it to, but they used it to great effect: saving their ammunition for an opening when they could fire on the advancing queen. The queen was focus fired by a marine squad as well, but the M60 undoubtedly did the most significant damage.
Also: Event Guidelines