This switch operates the Magazine cutoff. The cutoff enables the gun to open the chamber and remove the shell to insert a different shell into the chamber, but it is done while the magazine remains loaded. This way, the chamber can be emptied and the extra shells in the magazine will not automatically load. Recommend you use the link below to the Owners Manual for the A500 model. The Magazine Cutoff operations are shown on pages 29 and 30.
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