Can you name what AR accessory this is?
Lloyd called out the answer in the comments ast a “latch, charging handle, ambidextrous…. Demaco C8 “.
It is a Diemaco ambidextrous charging handle latch as used on the Canadian military C7 rifles and C8 carbines.
It is a large clunky thing that catches on gear and seems like it was designed by committee. Fortunately they switched to a solid pin for the extended latch to pivot on. I’ve personally experienced the standard AR15 charging handle roll pin break with extended latches.