[presson]

For those who want to single load- you can easily adapt your existing magazine to allow it. Presuming you have tried to with the original magazine only to find it jammed. My original magazine I now use for single feed only:
http://www.youtube.com/watch?v=wguTqj3XsNA

hope this helps,
“I press on…to win.”

[presson]

the magazine failure to single feed is solved quite easily using the magazine you have- not by machining it. I have a link posted with a unproffessional (but it gets the job done) video. I see someone is selling an adapter to solve the problem. You really don't need it.
http://www.youtube.com/watch?v=wguTqj3XsNA