From AGM we have a Mid-Cap Magazine for MP40 / STEN
The Magazine
This is a replica of the standard 9x19mm MP40 Magazine. It has a 120 round capacity and is constructed from metal with polymer internals. It is loaded via speed loader through the top of the magazine.
Compatibility
This magazine is designed for AGM’s MP40/1 replicas as well as the AGM STEN MK2 replica. Compatibility with any other AEGs is unconfimed.