Everyone who has a TA 9mm bolt should change out the firing pin and spring ASAP. Again I'm really glad I found this out before running the bolt but if you're running one now with the spring and pin it came with change them out before you go to the range again. The TA pin is approximately the same OAL (I think) but everything behind where it mates with the retaining cotter is machined differently. A picture is worth a thousand words and unfortunately I don't have one but suffice it to say the TA firing pin is different from industry standard (Colt, RRA, etc).
When assembled the rear of the stock TA firing pin barely protruded from the bolt (where the hammer would strike it), versus the RRA pin, which protrudes approximately 1/16th inch (give or take, eyeballing it). I imagine this would put more stress on all involved components and is out of spec either way.
The spring is also different and inadequate: longer, narrower and weaker per unit of length. On paper this spring might have been a superior option but in practice I can see how it would easily bind or otherwise fail prematurely. It's unclear whether the firing pin was machined to accommodate this new spring or if the machining was just off period, but either way both parts should be replaced.
If I had to venture a guess, they were trying to solve a problem that didn't exist with this off-kilter pin and spring while saving a few pennies along the way. Didn't work out.
Fortunately ~$15 in parts from RRA fixes an otherwise fine (NiBo) bolt made, presumably, by toolcraft.