Cool grip, not sure if the construction is a carbon copy of the RS one. The trigger guard is a seperate piece from the actual pistol grip, fastened with 2 fasteners hidden above the grip. Comes with its own magwell(might not use it for this build), and a profile matched mag catch with extended button. The grip profile is more oval than stock Hi-Capa, more akin to TK Tactical grip in feel. Also features undercut trigger guard. The grip also comes with CNC backstrap/MSH with checkering.
There is definitely some expensive machining here, and it looks like it'll fit well with the ProG4/Illusion Kinetics/Airsoft Surgeon style frame. Though TBH I don't know for sure as I don't have a gun to build this on yet(lol). Is it worth $400? That's up to you....