yes it will fit just fine "Fits All Modern center fire J-Frame revolvers with the frame mounted firing pin" The J-Frame Duty/Carry Kit is the next evolution of drop in parts from Apex Tactical Specialties. Installation of this kit reduces the trigger pull weight of your center fire J-Frame* Smith & Wesson Revolver by approximately 3.0 lbs. from factory specifications.
Features and Specifications:
Manufacturer Number:103-106
Includes:
One Apex Rebound slide spring
One Apex Main Spring
One Apex XP Firing Pin
One Reduced power firing pin return spring (light)
Fits: All Modern center fire J-Frame revolvers with the frame mounted firing pin.
Installation requires no fitting or modification to the factory springs or parts, just remove the factory parts and install the J-Frame Duty/Carry Kit.

yes it will fit just fine "Fits All Modern center fire J-Frame revolvers with the frame mounted firing pin" The J-Frame Duty/Carry Kit is the next evolution of drop in parts from Apex Tactical Specialties. Installation of this kit reduces the trigger pull weight of your center fire J-Frame* Smith & Wesson Revolver by approximately 3.0 lbs. from factory specifications. Features and Specifications: Manufacturer Number:103-106 Includes: One Apex Rebound slide spring One Apex Main Spring One Apex XP Firing Pin One Reduced power firing pin return spring (light) Fits: All Modern center fire J-Frame revolvers with the frame mounted firing pin. Installation requires no fitting or modification to the factory springs or parts, just remove the factory parts and install the J-Frame Duty/Carry Kit.

It most certainly will Richard. The Model 442 is built on Smith & Wesson's famous J-Frame. Installation how to video here : youtube.com/watch?v=j5STCRfVhms

yes it will fit just fine "Fits All Modern center fire J-Frame revolvers with the frame mounted firing pin" The J-Frame Duty/Carry Kit is the next evolution of drop in parts from Apex Tactical Specialties. Installation of this kit reduces the trigger pull weight of your center fire J-Frame* Smith & Wesson Revolver by approximately 3.0 lbs. from factory specifications. Features and Specifications: Manufacturer Number:103-106 Includes: One Apex Rebound slide spring One Apex Main Spring One Apex XP Firing Pin One Reduced power firing pin return spring (light) Fits: All Modern center fire J-Frame revolvers with the frame mounted firing pin. Installation requires no fitting or modification to the factory springs or parts, just remove the factory parts and install the J-Frame Duty/Carry Kit.