HK has a reputation for the worst customer service and product support in the firearms industry, not to mention everything costs more than it should. I waited 8 months for a roller block retaining clip for our mp5/40s, effectively sidelining the guns for the entire time. Then, they stop making the guns and parts supplies became even worse even though promises of continued support through the life cycle of the weapon system were one of their big selling points. We experienced the same problem with the G36k's and finally said, **** it and bought Colt, who at the time wasn't much better but were at least we could get parts....from other manufacturers.
Sorry none of you got my reference.