This is an adapter for the CYMA Thompson AEG that allows it to receive 30 round shell-type magazines.

This adapter is shorter than the standard magazine, allowing the Thompson to be more effectively used while prone or in tight spaces.

Shell-type magazines are more affordable by capacity than replacement Mid or High capacity magazines, making them optimal for users on a budget.

Please refer to the most recent design, which may differ from those pictured. 0.28 or better with organic supports, printed on the side for best results. 

PLEASE NOTE: There is a slot at the front of the device where a small, plastic reed can be cut and inserted to help prevent leftover BBs from falling out while reloading.