CYMA AK 47/Kraken inner barrel
 

I read on a UK airsoft forum that the newer CM.028 AKs have been fitted with a 6.03 mm brass inner barrel instead of the original aluminium. Anyone know if this is true? I always thought it was a 6.08 mm barrel. Presumably the brass barrels in the newer Krakens would be the same. 6.03 sounds too good to be true, I though even stock TMs are 6.08.