I have done trigger jobs on several 380 thunders. My basic workflow is . . . disassemble lower rearward of trigger and magazine catch . . . I use Flitz polish and high speed cotton wheel on die grinder to mirror polish:: #33 hammer strike surface, hammer sear surfaces and hammer pin hole side surfaces, #36 cocking piece sear engagement surface, #28 disconnector inside surface and all other bearing surfaces, #1 the slide middle bearing surface where it contacts the hammer front to back, #35 hammer spring reduce OAL of spring by one coil and grind OD of spring down by 8.2%, #60 barrel mirror polish feed ramp and chamber throat, #1 frame polish bearing surfaces where it contacts #28 disconnector. This procedure smooths up the trigger, removes grit at sear disengagement, reduces double action trigger pull, reduces single action trigger pull. Reduces slide cocking force. Does not result in excessive slide bump. (recoil spring is not changed)