The apex j-frame duty/carry kit is the next evolution of drop in parts. Installation of this kit reduces the trigger pull weight of your center fire j-frame smith & wesson revolver by approximately 3 lb. From factory specifications. Reduces trigger pull weight by approximately 3 lb. From factory specifications. Works with all modern centerfire j-frame revolvers with the frame mounted firing pin. Does not function in the polymer bodyguard .38 revolver.