Interesting you say that Mic.
But I think you could possibly be correct.
I've always assumed the S10 was softer because the size of the diameter of the round barrel. But having a second look at the 2 the barrel on the S12 is 8 inches long compared to the S10 which is 7inches.
My asumption also was based on the fact that the S12 came with a silencer where as the S10 doesn't.
Anyway good luck guys on your choices of S10 or S12 I think they are both value for money especially at Andrews prices.
Cheers,
Gazoom