Well, not that you are saying this, but definitely don't do it with live rounds and don't try it with other calibers. We used these:
http://www.brownells.com/.aspx/sid=2...Yellow__Qty_10
The round will seat in the mag (between regular 5.56 rounds) without a problem. It will also chamber, but because of it's length it will not stop the next round from chambering. Presto! Double feed. Sometimes they get a little jammed in there and took a little extra work to remove, but generally they were able to be cleared by vigorous remedial action. Sometimes becuase it's not quite a true double feed, immediate action (push, pull, rack, bang) took care of them. But it was the most reliable way I've seen to induce something more than FTF.
Most of the drills we ran interspersed 5.56 rubber dummy rounds, live rounds, and these to generate fairly unpredictable malfunctions are regular (but not constant) intervals. A sample setup might be:
2 live rounds
1 .40S&W dummy round
3 live rounds
1 5.56 dummy round
2 live rounds



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