On a P3AT you can't half stroke the trigger to fire it after firing a round. Wouldn't shortening and lightning the firing pin spring make it possible. If you shortend the firing pin spring and modified the firing pin to allow for the shorter spring one in it would allow the hammer to hit the primer harder from half cock. My only forseen problem would be with a much shorter or softer spring it would allow the firing pin to hit the primer to hard if you fired a full stroke. Which could rupture a primer and potentially turn the gun into a grenade.