The M16 makes a fast bup, bup, bup, It sounds almost like a burp.
The AK47 makes a slower pop, pop, pop, You can hear each pop clearly.
I learned to tell the two apart, I learned well.
I don't want to hear either one again. Ever.
I can never understand why politicians insist on making these guns legal for civilians. These things were designed for one task: killing people. They did that job very well in Viet Nam. I know because I typed the condolence letters to their families.
I haven’t fired a gun since Vietnam except as part of an honor guard at funerals. Even firing blanks triggered my PTSD so I had to stop participating in the honor guard.
Leaflet dropped by the intelligence (but not necessarily intelligent) people to encourage the Vietnamese to turn over weapons they had found.