Purchased one a while ago, it sucked and so I returned it. They sent me a brand new one and I had high hopes.
Finally got to take it to the range but had two problems.
1 - Inserting and removal was very tight.
2 - There was 2 times the drum stopped. A light tap each time and it finished running.
I really don't want any dealings with AO any further so, if you have patience and are handy then here is a good deal for you.
I will sell the Drum for $200 delivered. My lack of patience with AO is your gain.
Let me know if you have any questions.

