I have a 16 gauge 215k that I purchased new in 2003.
It currently has over 40k rounds through it and is still tight as can be. It is known to be a 'death ray.'
That's really good to hear.
I have a pair of Grulla made guns arriving any day now and, whilst one likes to trust what the dealer says about robustness, it's reassuring to hear they they can genuinely take some good use.
Out of curiosity, has the finish held up as well as the functional side of things? (from your photos it looks like it has?)