Here's a hint: When you get the magazine mounted high enough for the bolt to pick up a round you run into an interference problem between the bolt head and the magazine feed lips. All I have handy is a PMag and a Savage CRF bolt head, but it should still show you well enough why it won't work.
As you can see, the shape and size of the bolt head just doesn't lend itself to being able to pick up a round from an AR magazine.
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