Up for sale is The Tactical Development (TAC DEV) Forward Halo - THICC is an ultra-low-profile forward optic and accessory mount designed specifically for the FLUX Raider P365 chassis system. 

It is preowned, but in excellent condition.
Design & Build: CNC-machined from durable 7075-series aluminum.
Chassis Compatibility: Fits both the FLUX Raider P365 aluminum chassis and the UL polymer chassis.
Optic Mounting: Provides 2 direct-mounting locations on top compatible with RMR or RMSc footprint optics.
It is being sold as pictured, with the original box.