PREM Version

Version weapons (or just premium weapons) are weapons that do not have a or Black version, but instead come with a whole host of bonuses, which include and are currently limited to:
 * Free augmentation
 * Free augmentation respec
 * 50% bonus xp per kill
 * 50% bonus mastery progress
 * Permanent weapon inventory size increase by 2 slots
 * One premium for each new/existing character when bought

Premium weapons
These are the weapons that have these bonuses. They must be bought with NK coins, which can be earned by luck via level spin or must be purchased with real money. Some guns have a level requirement of Lv 20 or Lv 50:
 * Handkanone
 * HIKS A10 Assault, Lv 50 , US$31
 * Ronson WPX Incinerator Flamethrower, Lv 20, US$12
 * Planet Stormer Ltd Edition  Assault, Lv 1, US$6
 * Donderbus Shotgun, Lv 1, US$8
 * Torment Rocket, Lv 50, US$40
 * CM 505 Alpha Ltd. Edition
 * RIA 15 SE SMG, Lv 20, US$12
 * HIKS S4000
 * Ronson 5X5 Shotgun, Lv 20, US$12
 * CM 000 Kelvin Assault, Lv 50, US$40
 * Vitriol Rocket, Lv 1, US$8
 * RIA 8A
 * Supermarine Alpha Ltd Edition
 * CM Laser Drill Laser, Lv20
 * Ricochet
 * CM 352 Quasar
 * CM 467
 * RIA 75 Sniper, Lv 20, $15
 * HIKS 888 CAW Sniper, Lv 50, $40
 * Bayonet Assault, Lv 1, US$7
 * Zerfallen
 * CM Proton Arc
 * Contagion
 * Ahab
 * Calamity
 * Banshee
 * CM 369 Starfury
 * T-189 MGL

Trivia

 * weapons generally have yellow/gold marks somewhere on the equipment. The HIKS A10, HIKS 888 CAW, Vitriol, Calamity, Contagion and Ricochet are exceptions.
 * Like the majority of Black weapons on Mobile version of the game, some  weapons (aside those already exclusive on Mobile) retain their display images from PC.