The Rogak P18, the lowkey infamous counterfeit of the sexy Steyr GB.
I could go over every single detail like I'm reciting the ForgottenWeapons video, but I'll just be short about how it works: it doesn't, and the manufacturing is comically shitty when you look up close.

Not being able to get even remotely close to making a gas seal so that the gas delay can, well, delay the slide, the quick and dirty solution is to cut off or omit the extractor (depending on the individual gun), and then insert a stack of metal plates and fiber buffers in the frame for the slide to impact. The extractor not being there means it doesn't try to tear off rims anymore, but the buffer stack does almost nothing at all to absorb the impact of the slide, the stack is fragile and it can easily come loose from the frame and then not do its job.

I assume that extremely few of these pistols have a roundcount past the double digits, coming from a mix of people giving up from them not working, or exhibiting its 'intimidating' characteristics.
Contrary to some more optimistic estimations, it's also almost guaranteed that there were only ever a few hundred of these made at the very most, the serials are not directly indicative of production (extra zeroes added, and sporadically), so these absolute pieces of shit are actually very rare.

If you own a real Steyr GB, one of these might be funny as some sort of "Dr. Jekyll & Mr. Hyde" kind of thing.