My best with a sniper rifle was with the m24 on sharqi hotel, The Mec had capped it from us and the havok just spawned, I took out 3 guys heading for it when they popped outta the stairwell, And my back up sniper with the .50 cal did'nt let it take off he was popping them in the cockpit. Funny thing was i did'nt even have to aim for their heads since they were teamwounding for the heli.
My best with an unscoped weapon would be with the G3 on wake, I was raping carrier and i was the squad leader, I hid in the mast area, My guys were spawning on me with AT, Sniper, and Support on me, After a while an AZ-10 took off and killed me, The only guy who spawned as medic revived me, I moved down to the boat dock and came around to the other side where the heli spawns, I found a nice hiding area and with my G3 i was popping people pretty nicely with 200m and up headshots, Anyway on my last clip the f35 spawned and i killed 3 guys that ran to it, Then with 10 rounds left i saw 2 guys were running for it so the first guy boom headshot! Second guy comes back to revive him, Another headshot for me or so i thought, I miss him but i get the guy he revived, He ignores him and goes for the jet, He is like 5m away when i pop him in the head.
I've got alot more stories but i dont feel like typing anymore.