Original Korean War era USMC M3 evening eyesight scope The M3 carbine was an M2 carbine fitted that has a mount built to accept an infrared sight to be used in the evening. It was initially employed While using the M1 sniperscope, and an Energetic infrared sight, and saw action https://donovanfuhwn.ampblogs.com/5-easy-facts-about-semi-auto-rifle-7-62x39mm-mil-spec-described-71801355