?How to play with M4 Custom?

Hey guys i ve got a problem: I won the m4 custom from BM (it was in my 1. crate) but i cant play so good with it. When i burst with it it makes not enough damage and spraying, well.. i think itz something for noobs. So have you any tricks (or tippps) for me to handle the m4 custom??
(sorry for bad english)

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