GHK MK12 Mod 1 Z-Parts/Samoon

Assembled from a GHK M4 barebone kit. Additionnal parts are :
-Z-Parts MK12 front rail and outer barrel ;
-Samoon pistol grip "HK style", Samoon charging handle, Samoon "piano wire" spring, Samoon "captain america" hopup chamber (installed), Samoon steel base chamber, Samoon magnetic bolt lock, Samoon ambi mag release ;
-Maple Leaf inner barrel, Maple Leaf hopup (second hopup, not installed, for spare) ;
-ProWin speed buffer ;
-Ratech NPAS, Ratech "maritime" bolt catch.

All originals parts included. Never saw any action, parts of my collection now for sale...