trash cans suck to shoot through then using sub machine guns.. best level would be anything that has house.. since most people will be looking out windows to shoot at you.. flash them or take a couple shoot at their head then finish it by shooting through the wall.. most the times when you shoot someone in the head area they will duck to hide which makes it easier for you to get an upper body shot on them.. it will still take you some time with the vector just because it's one of the weakest guns.. oh and make sure you use stopping power with that gun.. i noticed without it ill be shooting clips into people through a wall and they still don't die..
best map would be favela i think.. i get most my fmj kills on that one.. scrapyard seems like it should be easy but i found it difficult.. you might have better luck on scrapyard then i do.. anyways.. make sure you don't put a silencer on it with fmj's.. you'll have a hard time killing people through walls.. unless it was just me.. lol..
See that generater thing in subbase? That has glass around it then theres stairs you can go up? Keep shooting threw that, Its heavy traffic and a few easy kills, You can get 5-10 penetrations this way
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