This is a Radian Weapons Charging Handle known as the Raptor, model R0066.
The silencer-optimized Raptor-SD features a ported shaft designed to redirect gasses down and forward" away from the shooter's face when shooting suppressed. Its ambidextrous design allows rapid palm "blading" or finger-thumb charging of the weapon" ensuring the motion is fluid and fast from either strong or support side. The Raptor-SD is compatible with most AR15/M16-pattern rifles.
Features:
Aircraft Grade 7075 Aluminum
Ambidextrous
Mil-Spec Anodized
Made in the USA