Our take: The NEW AGM MP40 Magazine is a high quality magazine that is fully compatible with AGM’s line of MP40 and Sten MKII AEGs. This metal magazine will hold 40 rounds and serves as a perfect spare that will ultimately save reloading time. The magazine"s capacity also comes close to that of the real steel MP40 and Sten MKII submachine guns. Additionally, this magazine is a great addition to any World War II MilSim loadout! Specifications: Construction: Metal shell / Metal and plastic internals Operation: Mid Capacity Spring Magazine Capacity: 40 rounds Weight: 7oz Compatibility: AGM MP40 /Sten MKII AEGs Note: This AGM Mid Capacity magazine MAY be compatible with other manufacturers" MP40 or Sten MK2 AEGs, however, Airsoft Megastore CANNOT GUARANTEE fitment. Airsoft Megastore recommends using a speedloader to load this Mid-Cap MP40 magazine.