Initial Korean War period USMC M3 night time vision scope The M3 carbine was an M2 carbine fitted having a mount meant to take an infrared sight for use at night. It had been originally used with the M1 sniperscope, and an Energetic infrared sight, and observed action in 1945 https://b-t-industries-9mm-handgu21105.scrappingwiki.com/1469034/james_river_armory_m72b1_rpk_carbine_things_to_know_before_you_buy