Question: which adc has the longest range?
Answer: Caitlyn has the highest at 650 until Tristana outscales her at level 14 with Draw a Bead. Tristana has the highest range at 703 when at level 18. Kog'Maw's level 5 Bioarcane Barrage gives him 710, however, and Twitch has 800 with Spray and Pray.