I got two from wolverine supply and used one for first time the other day.
I experienced problems with the last round being ejected at the same time as the 4th spent casing being ejected.
Other times the last round would end up backwards in the open action, unfired.
The front of the ramp appears raised higher than it needs to be, causing the last round to urgently leap out and eject prematurely.
I really don't like the long shlong look of the 30/5 mag either. Not sure why I bought them honestly. Good price is why I guess.