Always erred on the side of caution when it comes to things like weapons. I’ve also always believed that cost in terms of what is canon should be considered but easily discarded in the name of balance. At the end of the day it’s about finding what weapons its comparable to and pricing them accordingly. That being said your suggestions on reflection would bump the cost into an are awhere it’s at a comparable cost.
I like your idea on upping the range to Long to give it a useful niché and perhaps expelling the power pack isn’t such a big deal. Useful for when you need it.
K-16 Bryar Pistol - Revision
K-16 Bryar Pistol (Ranged [Light]; Damage 5; Critical 3; Range [Long]; Stun Setting, Accurate 1)
Price/Rarity: 1,350 credits/6
Encumbrance: 2
Hardpoints: 2
Secondary Fire Mode : When using the K-16 Bryar Pistol, as a maneuver the user may charge the gun giving the next attack by the weapon +4 damage. This causes the weapon to immediately run out of ammo.