Well, a Phased Plasma Rifle in the 40 Watt Range, of course.
CD Projekt RED's mad street rep would get even madder (in my book, at least) if they made a little in-game cutscene that would play out upon entering a certain gun shop in Night City, where you'd overhear a big bulky guy at the counter asking for said Phased Plasma Rifle in the 40 Watt Range in a thick Austrian accent and then actually get handed one.
He then just silently would pay up and leave the shop, but not without briefly fixating you with a cold blank gaze (including a hint of red light coming from behind the pupils) while passing by on his way out.
When the cutscene ends and it'd be your turn at the counter you'd have the opportunity to ask for a Phased Plasma Rifle in the 40 Watt Range as well, but when doing so the clerk would only shrug, point to the shop's entrance and respond "Sorry pal, that was the last one."