This replacement or spare magazine is compatible with your gsg mp40.
Caliber: 9mm Luger
Capacity: 10rd
Finish: Black
Model: OEM
Material: Metal
Model Fit: MP40
Brand Fit: GSG
Capacity: 10
Caliber: 9mm Luger
Capacity: 10rd
Finish: Black
Model: OEM
Material: Metal
Model Fit: MP40
Brand Fit: GSG
Capacity: 10