This is what should've been in TF2C from the beginning of the Deathmatch mode's history.
This mod replaces the Stengun in deathmatch with DannyBoi's Fruit Shop Fiend on default smg animations. I wasn't able to find proper assault rifle animations that didn't fuck up the merc's arms. One might be better off making custom animations.
All the weapons' sounds are replaced with the respective sounds of the M4 of CS:S (Reload sound also affects SMG).
To install, drop the folder into your custom folder in the TF2C directory.
Also, big thanks to Maxxy for letting me use his promo image.