DMAG Helix
Below is a video I made on the Helix. So far they have fed perfectly every time without fail. They are sturdy and of relatively simple design. Since the Storm is not FSR capable out of the box (requires a different bolt) I was not able to test these with FSR. The detent system seems like it could of been designed a little better. Sometimes the detent didn't reset automatically but thats a simple fix with a thumbnail to pull it back out. I do know that it has fed roundball flawlessly for over 2 cases. It still requires a little slap to seat in the magwell but nothing like the original DMAG. The Helix is pushing me more toward M.C.S. products by itself, let alone my experience with the Storm(of which I plan to order 3 shells for my 98 internals sitting in a box).
Helix size comparison to real AR15 .223 Magazine