Here is a light machine gun the Swiss Bern arsenal developed in the 1940's...utilizing a toggle mechanism...with spent casings ejected to the left side.
Photo credit from V. Bobba's book on Swiss lugers, on page 134 :
<a href="http://forums.lugerforum.com/lfupload/togglemachinegun.jpg" target="_fullview"><img src="http://forums.lugerforum.com/lfupload/togglemachinegun.jpg" width="400" alt="Click for fullsize image" /></a>
Regards,
Pete... <img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" />