I have an HK45 and HK45c, both US made (DA/SA triggers) with BF date codes. A friend of mine bought an HK45 and HK45c, both German made (DA/SA triggers) with BH date codes.
Here's the rub. The German ones have smoother and lighter triggers in DA (about 0.65 lb lighter). The SA and reset are the same. That really bothers me.