First Korean War period USMC M3 night time eyesight scope The M3 carbine was an M2 carbine equipped which has a mount built to accept an infrared sight to be used during the night. It was to begin with employed Along with the M1 sniperscope, and an active infrared sight, https://reidpixgu.wikikali.com/1339288/5_easy_facts_about_semi_auto_rifle_7_62x39mm_mil_spec_described