What is TFA? I've never heard of it, could you give me some examples/pictures?
TFA Base by itself is a swep base that takes the stat system and bullet physics of CW 2.0/FA:S2 base and mixes it with the SWEP Making accesability of M9K.
The base packs are literally the entirety of M9K minus the Specialties pack, so you can get the assault, smg, shotgun, and heavy TFA packs and M9K specialties for the best expirience.
Also, if you are adding PAC3, you should add the GMod Tower playermodel and accesories packs. They don't require any of the other GMod Tower add-ons to function and they have a lot of variety.