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Someone gave me this idea while verifying round count for competition at Camp Perry. It's a simple ruler, but marked in rounds, instead of inches. You insert it in a double stack magazine till it hits the follower, and the top round in the magazine corresponds to the number of rounds loaded. One side is .223, the other is .308. Counts up to 20. It has a hole in the top, so you can clip it to your shooting stool.

These are also good if you eject a partial mag to clear a jam. Very neat little tool.

On my website for $10 with free postage.
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