What are these KAC parts?

Wheres-Waldo

Gunny Sergeant
Full Member
Minuteman
Nov 2, 2008
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Found two of these while sifting through my gun room.

The mating surface on top does not fit an RCO.

9183C2C4-3DF7-441F-834E-5C09577944A0.jpeg
 
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EDIT: pretty sure it’s for a PVS-4.

Weird. Kinda looks like it’s for a thermal or something. Similar to the Trijicon IR Hunter mounts. Looks too old though. No part number?
 
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