Fits my CA, Echo1,JG bodies. Capacity is nice. Winding is activated by a switch on the bottom of the mag. Should have a sound activated or pressure switch. Even moving the switch to the back where the battery door is located would be nice. Runs on a 9v battery. No misfeed issues. Did have to take apart and repair winding spring. Like a high cap the winding spring has a tendency to brake at the bend where the spring is attached to the wheel. If you can repair a high cap then this is no problem. Overall this thing is average. It works, its a bit noisy,manually toggle the winding with the current switch location is uncomfortable.
Fits all my versions of M16/4 and my scar
Winding spring issue
Toggle switch or lack of pressure switch (I am going to mod this one)
Rating: [3 of 5 Stars!]