They are built tough as nails. I wish I never sold the one I had, but if I still had every gun that I ever bought, I'd have to have a room built just for my guns, and ammo. That wouldn't be a bad thing, just very expensive!
I read an article several years ago, and H&K claimed that their barrels could with stand a round being fired while a squid was still lodged in the barrel. I aint going to try it, and I don't think anyone should, but non the less, I find it a pretty big claim.
DBAR