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Also tbh if you are using a soft type of ruber even if there is the bubble is still there, as long as it is a soft rubber the BB in going through the barrel, I assume that the force from the shot will somewhat compress the bubble enough so that it will still take the shape of the SCS.
The bubble might be a problem with a hard type rubber, but I am pretty sure it does not affect really the performance on a soft one and like M10 mentionned before me, now you have a chance that the range of movement from the hopup arm will not be wide enough and you will now be not able to apply enough hop once the bump removed which is much worst.
I would say what matters most is not the bumb, but more the groove in the hop-up arm where the SCS rest that makes a difference. If you are using an AK type hop-up system that being said (my MP5K and AK 105 are using the same system so) you have to file the groove in the arm so that the SCS rest evenly inside it, because if you put it stock like that most of the time the groove is more tilted to the right or left, it is not perfectly even.
With regular rubber bucking since the bucking is soft this angle does not really affect anything, but with the SCS if you put it stock and it is tilted a bit, this will screw up your accuracy more than the bumb trust me!
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