Airsoftjunkiez demo the Limited Edition Arcturus PP19-01 Vityaz Ztac AEG that they have at their store... "ARCTURUS K9T-CB PE (Performance Enhanced) AEG is limited world wide of 500 pcs. K9T-CB PE prominently features ZTAC style CNC aluminum hand guard, charging handle, and adjustable folding stock. The handguard features BASIS mounting system for easy mounting of accessories. This AEG has build-in PERUN V3 PE OPTICAL MOSFET ETU and V3S QD 8mm gearbox. K9T-CB PE enables advanced ETU programable functions, and adjustable trigger travel via adjustable trigger stopper."