I had a HK P30 that loved to spit brass into my chest. It ejected everything, just rearward at 6 o'clock. This was with Winchester NATO, Fiocchi 124 gr, and American Eagle 147 gr. Now it never jammed but it was annoying. I had run about 600 RDS of such ammo at this time. On calling HK they assured me that I obviously was running weak ammo. When I let them know what I was shooting they changed their tune and declared that I was limpwristing. Flat out on the phone. When I informed them that I had and do own USP Compacts, P2000s, all in 9mm and had been able to run those out of the box with 115 gr Federal Champion with no issues ever they declared that the recoil systems were different. The P2000/P30 come with the same manual and have the same disassembly (admittedly the recoil springs are different). When I asked about that I was told that I had been told what to do and the person on the phone stopped talking and waited for me to hang up, before which he said goodbye. Never at any point did they offer to take the gun in. This was I think 18-24 months ago. At the time I was doing about 8000 RDS of 9mm a year almost all with HKs. I finally broke it in by racking the slide about 200 times a day and leaving it locked back for a week (we have countless threads about how locking a slide back doesn't wear in springs, all I know is my experience). About a year later I bought another P30. I broke it in with 115 gr ammo no problem and it ran like a Swiss watch from day 1. I neither changed my shooting style nor exercise regimen during that time.
My point? I own mostly German cars. I am often told a certain bug or oddity is a "feature" and if I disagree then I am told I must not be using the car properly (luckily I now know the main service writer so well that he listens when I say there is a problem and takes me seriously). My dad has owned dozens of cars in his lifetime (family of long distance commuters). He says that if you tell a Japanese automaker they have an issue they apologize and fix it when possible. If you tell an American automaker they listen politely but mostly ignore you. If you tell a German automaker they become angry and ask you why you insist on misusing their car. This attitude is, to me, prevalent in my experience with HK. I don't think the OP is lying and I know what it is like to be called the crazy guy because "something like this doesn't happen".
My point? I own mostly German cars. I am often told a certain bug or oddity is a "feature" and if I disagree then I am told I must not be using the car properly (luckily I now know the main service writer so well that he listens when I say there is a problem and takes me seriously). My dad has owned dozens of cars in his lifetime (family of long distance commuters). He says that if you tell a Japanese automaker they have an issue they apologize and fix it when possible. If you tell an American automaker they listen politely but mostly ignore you. If you tell a German automaker they become angry and ask you why you insist on misusing their car. This attitude is, to me, prevalent in my experience with HK. I don't think the OP is lying and I know what it is like to be called the crazy guy because "something like this doesn't happen".