Created a mod in MCreator (very much a work in progress) to add functionality to some perks of my Destiny themed TaCZ Addon pack.
You don't need to have the perk equipped in the gun.
Perks currently implemented:
Cloudstrike: On kill has a chance to chain lightning when enemies are close together and On hit has a chance to generate a lightning bolt.
Zhalo Supercell: On kill has a chance to chain lightning when enemies are close together.
Suros Regime: Last half of the mag deals bonus damage, and kills have a change to apply regeneration to the shooter.
No Land Beyond: On kill the gun receives a damage bonus for 5 seconds.
Bad Juju: On kill has a chance to give strength to the shooter up to level 5.
Thorn: Apply wither effect with custom particles and spreads to close targets.
Outbreak Prime/Perfected: It has a chance to apply Corruption effect which increases the damage received by the target; the higher the level, the more damage received.
Ace of Spades, Necrochasm, Graviton Lance, Ice Breaker: Added explosion only on kill.
Planned:
Red Death: On kill has a chance to apply regeneration to the shooter.
Hawkmoon: Last shot has a chance to do extra damage.