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Bashing Finish (Combat)

Source Advanced Player's Guide pg. 151
You follow a powerful blow from your weapon with an opportunistic bash from your shield.

Prerequisites: Improved Shield Bash, Shield Master, Two-Weapon Fighting, base attack bonus +11.

Benefit: Whenever you score a critical hit with a melee weapon, you can make a shield bash attack against the same target using the same bonus as a free action.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 114
When you fail to confirm a critical hit with a melee weapon attack, you can spend 5 stamina points to make a shield bash attack against the target anyway. You still can’t make the attack if the target is immune to critical hits.