No! Shoot subsonic for max quiet with suppressor, otherwise, blast away! This is not a delicate two stroke engine that needs careful attention in infancy. Go shoot your HKs and be happy!!
I'd love to but can't. I have 2000rds of S&B 150 sub's sitting at my transfer FFL and Michigan's great Governor feels she knows whats best for us. She says that gun shops are not a vital part of our well being and our families security so they are all closed and we are on basic lock down until 1st of May if not longer. I'm just glad I'm in a less populated area. Even at that, I have a weapon with (2) 30's clamped together within arms reach and at the ready.