There's 2 ways to wield 6 BF-guns, btw, and I'm only pointing out one: SURGE.
Rigger could have all kinds of guns in a vehicle/Drone/Medusa Extentions.
Nartaki with Monkey Feet Cyber limbs. Or Just Cyberguns in Cyberlegs.
Mage with Prehensile Tail Weapon and Magic Fingers.
Implanted Cybergun in CyberTorso and/or CyberSkull.
Burn out Nartaki Mage with Magic Fingers, Prehensile Tail, Cybergun in each Cyberleg, plus Cyber Torso, plus Cyberskull and four in the Arms.
Burn out Nartaki Mage with Magic Fingers, Prehensile Tail, Cybergun in each Cyberleg, plus Cyber Torso, plus Cyberskull and four in the Arms and Medusa Extensions.
(Can't recall 5th Edition has a weaponized tail option...)
I'll stop. But holding lots of guns, no problem. Meaningful dice pools are usually the issue.