I have the last research links from writing the third draft of Cricket and Grey.  I offer them up with no preamble:

https://en.wikipedia.org/wiki/Heckler_%26_Koch_MP5

https://en.wikipedia.org/wiki/AK-47

https://www.nlm.nih.gov/medlineplus/ency/patientinstructions/000315.htm

https://www.ldschurchtemples.com/portland/

That’s it, actually.  More guns and how to dress wounds.