Clockwork Assault Rifle sits in the Early Hardmode tier of Terraria progression based on its rarity rating (4).
Unreal is the strongest prefix for Clockwork Assault Rifle — +15% damage, +10% speed, +10% crit, +15% knockback (ranged only).
Clockwork Assault Rifle deals 17 base damage, 4-tick use time. Use the DPS calculator to see expected damage per second with prefixes and crit applied.