Best wishes on the surgery. And I hope FN sends support rather
than attorneys.
I had a 9mm case head failure, in a Browning pistol. Fortunately
for me the failure wasn't this catastrophic, and the pistol
contained the blast. The blast drove the magazine follower into
the mag floor plate, destroying the mag, and put some new bend
angles on the extractor. I had new mags, and new extractors, so
after a thorough inspection, a new mag, and a new extractor,
the pistol was back in service. I did give my hand a few
days to stop buzzing, but all was good in the end.
I hope your adventure ends well.
Squeeze