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Wish I knew. I've only put maybe 500 rounds through my TNW ASR, and doubt the firing pin will break any time soon, if ever... but it's a spare part I've been hoping to buy since buying the carbine.
HiCal in Mission has said in these forums that they'll be coming in with some expected shipment, but searching their site - https://hical.ca/?s=tnw&post_type=product - I have never found one in stock. I check often. Bought spare pins from them, and a spare barrel (for $300!!!) just for the sake of having a spare barrel - the wall thickness for 9mm isn't huge so I figured it could get bent some day if I got very awkward and took a fall. Same with my efforts at getting one from TNW themselves. Never had a reply to my emails, not even when I asked, early on, about Canadian distributors who might stock spare parts. Good luck. I haven't gotten around to making one myself, but may resort to that if nothing else turns up.
If they'll ever respond to me, that'd be great. Happy to pay a reasonable price for one or two spare firing pins, maybe a couple of trigger group parts. I've tried emailing from both my own domain email which I've had since 2000, and from my little-used Gmail account. Zero response.