1st of all you need a good deadzone to kill people faster, use his deadzone he's one of the best on the game:
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Now the perferable load-outs:
M4A1 - High Supp. Red Dot
SCRW-LW - Lt. Supp - Red Dot
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STG-77 - Lt. Supp. Red Dot
SR-22 - Lt Supp. Red Dot
Practice Practice Practice and you will get there.
Any questions or further advice contact me.