It is possible a few grains of unburned powder of sand etc. got caught under the extraction star. Easy to tell. If it is not flush with the rest of the back of the cylinder, that could be it.
"It is possible a few grains of unburned powder of sand etc. got caught under the extraction star. Easy to tell. If it is not flush with the rest of the back of the cylinder, that could be it."
I just checked, it's flush, thanks.