Practiced Crossfire attack AK. Its really basic/old setup, but really nice.
This can be done in ~7-8sec, nade explodes at ~10-11sec. This depends on spawn and how quick you line up. Enemy AK gets in cafe behind counter in ~5-7sec (rush no smoke). Entire street is smoked with attack scope being able to peek right side A cross for rushers and maybe cafe window if smoke is centered.