After trying (and failing) to repair the chipped part at the back of my barrel, I bought a replacement directly from KWA. You'll need to email them about it but they're perfectly happy to ship to Canada.
As for why they made the barrel plastic in the first place, I imagine it's because the point of impact between the slide and barrel also happens to stress the thinnest parts of the slide, where the side rails meet the rear section. At the point of impact, either the slide or the barrel has got to wear out and eventually crack, KWA must've chosen the barrel to be the wear component. For this reason, I wouldn't recommend the RA Tech steel outer barrel for the M93R, under normal use it'll likely deform and crack the aluminum slide.
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Airsoft is where expensive things go to die.
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