Basically, the spring unit is a captured setup and the front part (that retains the spring) breaks off.
These kinda give an overview of the problem:
https://www.sigtalk.com/threads/reco...ailure.415445/
https://sigforum.com/eve/forums/a/tp...64&s=674608412
Here's a poll on Sigtalk about it--around 15% of the P210A owners (who responded) had the issue:
https://www.sigtalk.com/threads/have...-p210a.367902/
I mean, that's not great. That said... I'm inclined to think a higher percentage of the folks who
had the issue replied to the poll... so... there's that.
This guy discovered he was missing the front piece of the assembly before he knew it was supposed to be a captured setup--fixed it, then had it happen again:
https://www.sigtalk.com/threads/p210...spring.316826/
There's plenty more references to it on Sig Forum and SigTalk. DPMS (?) makes a replacement setup that some seem to like. And... I have read the gun continues to function--more like a traditional non-captured recoil assembly--if the thing breaks.
Net: There's a good chance it won't break. And even if it does, the gun still probably will work fine and there are options for replacement. But the gun costs $1300 and we shouldn't be having this conversation at all.
And,
for me, the ultra-light trigger sorta precluded its utility as carry/defensive option. So I decided to hold off. Honestly, I'd probably just opt for the full-size/all-steel model. But if the Carry offers a more practical trigger and a better spring setup... I guess I'd go that route, for those reasons.