These are some common tools used to work on this device. You might not need every tool for every procedure.
To look at a list of common problems, check the SG 552-1 Commando troubleshooting guide
Identification and Background
The SG 552-1 Commando airsoft gun is an automatic electric gun manufactured by ICS (I Chih Shivan) and VFC (Vega Force). It is a replica of the Swiss Arm Technology (S.A.T).
The gun features a folding stock, a full metal receiver and gearbox. It has authentic stamping on the upper receiver and aluminum die-cast on the lower receiver. The barrel length is 23 centimeters.