When u fire an m134.. You realize the crosshair moves left and rite.. Giving more spray right??

Anyway to get this on all guns?? For some reason my p90 does this and I thought I shud ask u guys. I got no idea how my p90 is like this but I always get head shot!

How can I get my m16a3 to do this??

P.s I wasn't sure which section so I just put in general