Its a charging handle. - Radian Weapons Raptor LT Ambidextrous Charging Handle

There's not much to say I don't think, it's a light weight charging handle with polymer latches. Due to the latches being made of polymer it comes in at a cheaper price point than their all aluminum version. I was a bit leery about the latches but so far so good. I have the flat dark earth version and it matches my other fde furniture very well.