Sounds like a casting defect to me, it's rare but it does happen. Guarder makes good metal gearbox shells but they seem to think powder coating the interior of the gearbox is intelligent...
G&P makes good gearbox shells as well, 7mm holes for bearings too which is really nice. We've got a guy in Mb who's an absolute hose with his 400fps G&P 249(I mean like 4 bags a game!!), he's had it for pretty much the whole season and he hasn't broken his gearbox shell yet.
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