The model is of really high quality, well done . Though I found a couple of issues:
1. The firing sound is too quiet
2. For 7.62 it really lacks a punch. Feels more like your standard M16 from the base game
3. As you mentioned, this is "Classic German engineering" which implies famous HK slap. As of yet, the reload animation is actually based on M16

What I am trying to say is that it would be nice to increase firing sound, change stats to at least match the basegame AK-47 and change the reload animation to MP5 style rather than M16 style (I believe it is all fixable from the weapons stats file)

hk-53????