FMJ kills are easier to come by playing hardcore modes, snipers are actually 1 shot kills. And yeah windows are the best. Highside is a good map for getting them cause you can shoot down the centre of the map through the windows, cubicles, poles, etc. It takes some time but I've unlocked all the attachments on all my sniper rifles. I couldn't imagine trying to do it in regular game modes though where it takes 2-3 shots to get a damn kill.
SPAS-12 has never been that effective for me. M1014 is pretty good though, maybe I'll give the pump action another shot! BTW in that video, wow that's a lots of people not using Cold Blooded. Some of those AC130 clips were just viscious.
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