I have been using this addon since the GitHub beta. It is by far my favorite ARC9 addon, because it adds just what I look for in GMOD customizable sweps: full customizability (aka: AWP becomes machien gun).
There is, however, one wish I have for this addon, one thing that I believe it lacks:
magazine options

A RPK with a 30rd magazine only, is very pitful.
The "AR-15+P90" without another magazine option, as the base swep pack has, is also very saddening.
Kalashnikov drum for the Chimera? I wish!
5.45mm Bizon magazine for the AK, as the N. Koreans have? Hopefully...

Nonetheless, this is my request:

Please, addon dev, add more magazine options for the guns and their presets!