Has always been my understanding (nd I've got one of the first KJW M700s sold in Canada) that the inner barrel is 6.05mm.
The inner barrel is really sensitive to being dirty, best to run a dry swab through it after every 20 shots. And use a file to smooth out the feed lips on the mags, they tend to be rather sharp and cut the BB surface. I can also confirm the Tanaka mags do fit as well.
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