Too bad you don't have any locaps, I'd check that first. At one point both my MP5 hicaps weren't feeding. Try winding your mag, then pull the spring catch and see if the BBs shoot out the top of the mag. All it takes is one strategically placed grain of sand to bring a hicap to a fast halt (happened in one of my hicaps, grain of sand lodged in a gear and my BBs whouldn't raise up the tube.)
Might also want to try getting a bit of oil into the breech to see if maybe things are just sticky there.
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