If you are currently running a standard M4 AEG platform, and you fancy a move to TM Recoil series of Airsoft Rifles, one of the tings that can be off putting is the cost of the NGRS Recoil Shock specific magazines.

This adaptor allows you to use your standard magazines, saving you a fair few quid. Obviously your gun wont stop on empty, but hey, its a small price to pay :)