Cooper Firearms Model 52 and 92 Ken Farrell (blued) 20 MOA rail, threaded 6-48 (pre 2017 production)
Cooper Firearms Model 52 and 92 Ken Farrell (blued) 20 MOA rail, threaded 6-48 (pre 2017 production), Ken Farrell 20 MOA blued steel rail for pre-2017 production Cooper Firearms Model 52 and 92 rifles with 6-48 threading.