Krytac CRB Mk2 This gun as been upgraded as follows Gears Shimmed Gate Aster SE with Quantum trigger Prometheus 6.03 285mm inner barrel Umbrella Armory piston MAXX HopUp S nub with 70 degree Macaron bucking MAXX Mag release Ace tech brighter C tracer unit M LOK Covers Dust cover and slide system removed so you can set HopUp on the fly. Gun has been fielded and tested This gun shoots like a laser beam!!!