G11/Mac11 shooting fully auto in single shot

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Hi guys,
I feel a bit of a noob but I've been trying to get to the bottom of this issue for a few days and can't find anything online;
I've bought a G11 (mac11) the box is unbranded so I assume it's a copy of something else. For some reason it won't fire single shots in semi mode, it may do a couple of times and then just starts firing in full burst. I really want to use it for a local CQB site and can't right now! I've stripped cleaned and greased it, but to no avail. This and a mag that looses its gas is really frustrating me!
Any suggestions would be great!

also worth mentioning when the slide(?) is off I can see the mechanism does work 

 
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