| MCEM 3 | |
|---|---|
| Type | Submachine gun |
| Place of origin | United Kingdom |
| Production history | |
| Designer | Royal Small Arms Factory |
| Designed | 1947 |
| Specifications | |
| Cartridge | 9×19mm Parabellum |
| Action | Blowback |
| Sights | Fixed |
The MCEM 3 was a proposed collapsible 9mm submachine gun designed by the British in 1947. It had a detachable stock alongside the magazine and a Lee-Enfield type bayonet. However the MCEM 3 was not accepted and found no customers.