That one rates in the top ten of nasty. On the bright side, it’s a peach compared to the rental at our local indoor range. It’s a testament to the design that they actually run.
Speaking of rentals, there’s one that has been averaging about 2,500 rounds a week (double on a holiday weekend) for over ten years now. They keep it on the wall behind a glass counter that contains the carcasses of worn out MP5’s. The old Sterling outlasted all them and still runs like a top.