Hi fellow enthusiasts,

After buying a second-hand, and very lightly used, AIA (Australianicon International Arms) M10 No. 4 about a year ago, and being very delighted with it, (the first picture)..

then, after seeing this NIB / unfired B3 pop up for sale a couple of weeks ago, I pounced on it....

I know that I paid too much for it, but I have never ever seen one come up for sale before. (the second picture)

Refreshing your memory, the limited edition B3 (150 units which were sold in an heartbeat ) is fitted with a tapered bore barrel from a GE 134 mini-gun and is rated for 100,000 + rounds life.

My question is, which AIA model has the thickest barrel? The B2 or the B3?

The B2 is the third picture.
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