Shooting the pistol with only the non-dominant hand. Required in USPSA when a stage designates weak-hand-only shooting. This is the most unfamiliar shooting skill for most competitors — the non-dominant hand lacks the dexterity, strength, and trained motor patterns of the strong hand. The same body mechanics that apply to strong-hand-only apply here, but mirrored — and everything is harder because the motor patterns are underdeveloped.
Weak-hand-only is a mirror of strong-hand-only with higher difficulty due to unfamiliar motor patterns. It requires grip strength in the non-dominant hand and trigger-control with the non-dominant index finger. Connected to gun-tuning — the gun must cycle reliably even with the weaker grip of the non-dominant hand (this is the ultimate worst-case test for spring tuning). The transfer technique connects to standing-reload through the hand dexterity requirements.