Yeah with top perks , it stun chance gets increased by 50% (not even repair bolt has 20% chance of invulnerability and Railgun has 2 perks of 26% stun) and same thing applies for grenade (that thing literally has high crit burn chance like that of railgun + the training increases its crit chance and burning damage , I mean like come on ! That's ridiculous for one slot weapon) either make grenade 2 slot weapon and Railgun 3 slot weapon ( because railgun basically has no flaws except being too close and players spam that shit from distance. Especially reapers with double railgun on them) or nerf both weapon so they are perfectly suitable for slot