Small parts for your V2 or V3 Gearbox such as Springsets and Screw sets from brands like SHS, Guarder, Retro Arms and Krytac.
SHS Long Axis D-Hole Shaft Guide with Spring DJ1013
Gearbox Spring Set
Guarder Gearbox Spring Set V2 / V3
G&G Gearbox Spring Set
V2 Gearbox Screw Set
Gearbox Screw Kit