Here is a list of the Aim Assist stats for the Legendary Snipers in TTK:
1000 Yard Stare: 56 AA
Defiance of Yasmin: 69 AA
Eirene RR4: 21 AA
Glass Promontory: 54 AA
Hereafter: 75 AA
Stillpiercer: 51 AA
Tamar-D: 65 AA
Tao Hua Yuan: 36 AA
Uzume RR4: 31 AA
Weyloran's March: 79 AA
Do you want to know why so many people are complaining about that 1000 Yard Stare, even though it doesn't have the highest AA (which, actually, probably doesn't work how you think it works)?
It's because it is the easiest Sniper to acquire and it has a high enough Impact to Revive Snipe. Every player gets handed one, so in actual fact people are just fed up of seeing it's name on their kill-screen, as opposed to the weapons statistics.
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Bump. Compare it to some of the Y1 snipers OP, it's even less than a lot of prominent Y1s.