Here's a list of weapons that can be implemented for new low levels that may fit in...

M14- like the Drakon its a recon weapon, but has a slightly higher mag capacity and fire rate but lower damage instead of being a two to three to kill its a three to four...
Russian OTS or TKB- just to add more bullpup flavor to the game than just the Aug
Colt 45, or the Chiapa Rino- both really good modern examples of the revolver
Keltec KSG- bullpup pump double barrel shotgun, now this one has flavor much more flavor than the genisis while also isnt spammy.
MP3- because the Mac 10 we have is alright, but i think there needs a bit more flaver for pistol mag smg's.