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Umarex MP5 A5 help!

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Recently purchased a used but mint MP5 A5 Sportline which worked well for a short while since will not fire at all, feels like a feeding problem, on firing it sounds like a slight grinding noise. Yet dry firing it sounds perfect and runs smoothly as it should.

I changed BBs to Devil Blaster to see if it helped but same problem.

I've cleaned the barrel using the rod but there's no jams at all.


Can anyone help as I really want to skirmish it but I can't use it like this


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