Help a noob

Ok every pro came from a noob and ppl say pro are good with m4 etc and only noob use smg like kriss or tompson and spray. Well I could kill multiple in one round snd with m12 but was doing horrible or not so good with m4 silver and gold. I really want to be good at those so can anyone give any suggestions on how to master m4? Thanks a lot!

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