Both of the following two sights reference
miscmod_mod_CombatRifle_Scope_SightsIronImproved "Combat Rifle Glow Front Sight Ring" [MISC:00185C09] as loose mod:
- mod_CombatRifle_Scope_SightsImprovedGlowIron "Glow Front Sight Ring" [OMOD:0019EADA]
- mod_CombatRifle_Scope_SightsImprovedIron "Front Sight Ring" [OMOD:000A7681]
With the loose mod in the inventory only one of the two attachments (OMODs) can be reapplied on a workbench, the other mod has to be crafted from scratch.