Angel Custom 1500 Round Thunderstorm Electric Winding Drum Magazine (Model: M4 Adapter / Black)

"Nice compact magazine that works like a charm!
Finally an electric magazine that is high quality, go Angel Custom!!

"I got the M4 version. I run a krytac body with a Spartan Engine in it.
I had consistency issues. It could be because the rounds per second is too high for the magazine to keep up with.