Just noticed this on Arnie's, slipped past a few days ago. Paintball-X
, a retailer in the US, seems to be offering a metal replacement nozzle for TM M3's (and SPAS-12). For those unfamiliar with the TM shotguns, they're very fun pieces, but have a pretty critical design flaw that manifests itself after a few thousand rounds and turns your shotgun into a paper weight.
There's no picture, and no extra information, but for $US24 it might be worth a shot. Anyone want to give it a try? I know there are dozens of busted TM's out there. If this part works, I'd love to hear about it.