I'm not sure if this has been released yet, but this is a m16 default to minigun. Now you have the super spy's gun as default. I forget where I got this, it might have been from a friend of mine, anyway, it works. Same speed, movement, and its fun.
You know, you take the time to make it look all authentic, you know when some stupid noobs post screenies or a Gold AK47 that still says AK47 in the bottom right hand corner but you manage to mod everything even the stuff in the shop