Never seen that before, about how many rounds do you have through that piece?
Took another look at the pic, is that a crack or machining line in the back of the housing?
Longone
I think this is a known problem. Mine is still O.K. but I keep watching for it. They will stake on an new spring housing most likely. This shouldn't happen on a $1.4K (what mine was) pistol from the S&W Performance Center.
My guess, like with the Ruger SR1911 front sight problem, S&W may have sourced some bad parts. The loss of that part is a bad thing and can shut the pistol down.