This gun is just crap compared to most ARs of the same archtype. It's perk turns it into a bullet hose in CQC but it has mediocre stability and an extremely low MAG which kinda ruins the gun. Let's change it to this.
Front lines, activates in close quarters.
-Greatly increased stability (Added counterbalance on top of the existing stability boost)
-Increased accuracy
-Increased firerate (Same as now, bullet hose firerate)
-Bottomless clip, kinda. Let the gun take from reserves as long as you're in CQC.
[b]ALTERNATE TO BOTTOMLESS CLIP IF THAT'S TOO MUCH.[/b]
-Increase MAG size to 55-60 and give the gun a passive +2 armor boost when held to match the shields on the guns design.
This would solve the MAIN issues with the gun, stability being a slight issue is solved with the extra stability from passive counterbalance. The BIGGEST issue which is MAG size from when it turns into a bullet hose would be solved by giving it a bottomless clip in close quarters.
It'd be a worthy exotic without being stupidly OP. Let's be real here, bottomless clip would help push kills when front lines activate but it wouldn't let you mow down an enemy team even with a bottomless clip because 9 times outta 10 the whole enemy team will just shoot you when you're that close anyways. So this perk change would be exotic, solve the issues the gun currently has, and it wouldn't break the game.
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Or seeing as you need to be so close to people for the main perk to activate, don't take the impact off for the rate of fire. To make it feel exotic, keep the existing impact stat while buffing RoF and stability. If that's too much, at least allow more impact considering you are at risk of the enemy switching and shotgunning you.