Saw this on eBay and was stumped. He says it's for an M1icon Carbine. Anyone know what this is?

ORIGINAL VINTAGE WWII WW2 M1? M3? CARBINE RED LENS FLIP GUN SIGHT

http://bit.ly/T1xLKm

Attachment 37367

Attachment 37368

Attachment 37369


M1/M3 Carbine: late '44 Inland
M1 Garand: late '44 Springfield
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