Product Description
Blued Front Sight Filler Screw for Mark 1 2 3 4 IV & All 22/45 with **6-40 Holes6-40 NC
In October 2019 Ruger switched the old 6-40 front sight threads for 6-48
This screw will not fit the newer pistols, will only fit the older ones.
BE CAREFUL AND CHECK THREADS BEFORE RUINING THREADS
