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I can only think of two reasons, 1/ You don't make sure that the BBs are loaded properly, every GBB will double feed if you leave gaps in the BB spacing in the mag; 2/ Possibly the mouth of your mag has too wide of a gap on it, causing two BBs to leave the mag and be chambered. How easy do the BBs load in, and does your mag empty of BBs if you press down on the top?
Seems like an odd problem, but I had a similar problem with my TM G17 springer, BBs would double feed, causing one to jam inside the slide. Fixed it by heating up and squeezing the feedlips together a bit. But, neither of my KSC G19s (one bone stock, the other metal slide & outer barrel) have this problem, nor do any of the 4 mags I have for it. And I run BOTH of them on propane constantly.
If your problem is the mag, being that the feed lips are too far apart for spacing, find a hard solid surface, use a small hammer, lay the feed lips on one side, and gently tap the lips closer together. Tap a couple time lightly, then check again. Might be the fix you are looking for.
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