Airsoftjunkiez demonstrated their Custom Expert MCX M13 HPA build, which features Heretic Labs’ premium Inferno and BlackLeaf trigger electronics for a quick binary trigger response. The build also includes several upgrades such as a VFC MCX, a PDI 300mm inner barrel, a Maple Leaf Bucking, a 4X Optic with RMR, and an EMG Guardian Tracer Unit. These upgrades provide an enhanced shooting experience for airsoft enthusiasts.