The gun isn't a problem in any mode except gambit. If there's a problem with invaders in gambit being too strong its because of the characteristics of the invasion mode itself, not the sleeper. As long as invaders have wallhacks with infinite range that persist all the time, they will feel OP whatever they are using.
Is sleeper a problem in normal crucible or any other mode? No, its not.
Do you think the calls for nerfs will stop here? No, they will target whatever invaders are using because the problem is the advantage the invader has and not the gun itself. I'm awful at normal pvp and i regularly get 4 invasion kills in gambit. If something is a problem in only one mode, maybe the mode needs adjustment and not the gun.
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don't blame it on the mode, it's balanced. 1v4 the one person gets an overshield. the other 4 get nothing. FAIR GAME. Of course sleepers not a problem in normal crucible because heavy spawns every 2-3 minutes so about 4-6 times a match but 2 spawn points makes it 8-12 times it spawns so heavy can be picked up 8-12 times each match. Also the infinite range is not problem, it is because it has insane aim assist and you get kills by aiming in the general direction of your target.