GHK/TWI Kochevnik

GHK AK74 with TWI Kochevnik kit. 
Mounted by Samoon with steel barrel, Bow Master complete hopup, Samoon piano wire trigger bar and TWI sling mount. Also come with an extra trigger bar replacement set (normal, not piano wire) and Hephaestus selector.
Never used, part of my collection now for sell.