u/A-Series-of-Tubes

I purchased a clip and pin service through HK Parts and sent in a new MP5 trigger housing to get adapted for my SP5. When I got it back, I did a fit test with my SP5 before installing the trigger parts and noticed it had a lot of vertical play at the front by the mag well, it was pretty firm in place by the stock, but could pivot up and down notably in the front. After working with HK Parts support I learned I evidentially purchased their universal clip/pin service for all makes which results in a subpar fit with SP5's and evidentially they have a SP5-specific clip and pin service I was supposed to use. After some juggling, I later got a replacement MP5 housing sent in for their SP5-specific clip/pin service.

Anyway, I just got this second housing back and it does the exact same thing. At this point I'm not sure if their services are just bad, they mistakenly did a universal fit service again instead of the SP5-specific, or if there's something I'm missing with how to seat this in securely. Maybe that's normal for empty trigger housings and it will lock better in place once the trigger pack is installed? I'm just not familiar enough with the platform to know. Any advice?

EDIT: For those referencing this post, you just need to install the trigger pack and it changes the fit so that it locks in very snug. Well TIL.