Factory RUGER Stainless Sear Pivot Pin Mark 1 2 3 4 MK I II III IV

Factory RUGER Trigger Pivot Pin Stainless Mark 2 3 4 MK II III IV

RUGER Stainless Mainspring Housing Latch Mark 1 2 3 MK I II III MKI MKII

RUGER Hammer Spring Mainspring Plunger Mark 1 2 3 MK I II III 22/45 LITE

Volquartsen LIGHT Recoil Spring VC3RSO-R Ruger Mark 1 2 3 4 22/45 & LITE MK IV

Ruger Mark IV Magazine Assist Ejector Plunger Standard (metal) Frame MK 4

Factory Ruger Firing Pin Spring, Rebound Support and Firing Pin Mark 1 2 3 4

RUGER Rear Sight ALLEN Set Screw Mark 1 2 3 4 & 22/45 & LITE MK I II III IV