Yes there are such devices. They are called single shot followers. If you have a Stagger-feed magazine then you need a Score High:
http://www.midwayusa.com/product/301...ester-aluminum
and if you have a centerfeed, then you need one from SSS:
www.sharpshootersupply.com
The centerfeed one goes in place of the mag, and the staggerfeed one goes inside the mag ontop of the follower. Either one is very easy to install, and can be removed to return to using the magazine.
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