I've never had a jam firing live rounds with my C7. Blanks when in training, yes, but they're filthy and you tend to shoot alot more of them than live rounds. Interestingly, I've found the best thing for keeping it running in Afghanistan is the cans of compressed air they issue for cleaning your computer. Blows the moon dust right out of it.
I wonder if the cooking off problems had something to do with the lighter barrel on the M4 vice the M16A2 / A4. When we first got into serious fighting in Kandahar, people were finding that the barrels on the C8 / C8A1 heated up too fast (14.5" A1 profile). That's why they went to the extra heavy 16" on the A2. Of course the M4 has a heavier barrel than the original C8 and I've not heard any complaints about them since.
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