I bought the one that wolverine modified for use with the CSA adapter, but it did not feed reliably. I could only load the mag with one round and it would chamber, anymore and it would not work. Talked to the owner and he told me to send it back and they will fix it.
I am really hoping that this will work as I want to use it for 3 gun. Surplus 7.62 x 39 is much cheaper than 223. I do not really think shooting corrosive through an AR is a great idea and the XCR is quite a bit more expensive.