To be honest, my assumption is that the SC3000 is the SC-20k without the attachments and a little newer. It feels like the same gun to me but only interests me because of it's bull pup design, silencer and high average statistics.
Which leads me to..
I'm liking the idea of the Gun Smith. I like the idea of finally being able to equip the gun s I favor with the scope and other attachments I favor. Rate of fire selection too? For any gun? I'm liking that.
Hopefully there will be save slots for more than one customization so I can have some selections for varying approaches.