Havent come across many other MACs bolting the weapon first either. Nicely done. If i was to be overly touchy about something it would just be the slight weightlessness of the animations, but that aint' a dealbreaker.
After playing with this gun for a while, i can honestly say that it's one of the best (if not the best) skins for the Mac-10 Things you can fix: sounds, i found them not appealing for my taste so i changed them. you can download my soundset for this gun: https://mega.nz/#!DFwm2I7D!vMNBqf8-DlksAzhIvVPmGwnF1_PN7OFXytm7QW5BgHE it's a mix of insurgency's original sounds, and a sound mod for insurgency. anyways though great job and keep it up!