Every rank
Each row shows the full effect at that rank.
Rank 1
Rivet Carbine: critical hits expose the enemy for 4 s. Exposed enemies take 20% more damage from everything (abilities and your other gun too).
Rank 2
Rivet Carbine: critical hits expose the enemy for 4 s. Exposed enemies take 40% more damage from everything (abilities and your other gun too).