So im not sure if this was an issue with this particular gun, with MP5s in general, or something on my end because I was downloading something in the background while this was taking place.

Here is the videos:
https://youtu.be/8PPiRFyDe8M
https://youtu.be/XXcsf_PlNZY
https://youtu.be/3XqyGYG32ao

Seems like maybe 2-3 of my bullets out of like 90 even registered.

I have 3 videos total of this happening, and it just seems like the bullets are not registering.