That's right. I've been slowly doing this for a while. No narration this time, but that saves me work, and that keeps this simple. Special guest appearance of a JuJi clone at the end.MORE INFO
The AR-15 and AK-47 have very different mechanisms. The AR-15 is more complex and was known to be rather unreliable in the past. Modern variants are still used today, with much emphasis on customization and much improved reliability.
The AK on the other hand is much more simpler and can work even when thrown in dirt, water or mud. It is used in many countries around the world and is known as the "rebel" or "terrorist" weapon.
The very first known assault rifle was developed by the Nazis in WWII, known as the StG-44: [link]
It was to combine the characteristics of submachine guns and full size rifles (known as using an "intermediate cartridge")
On the subject of supersonic bullets, rifles cannot be silenced when fitted with sound suppressors for this reason. Suppressors can still alter the sound and muzzle flash of the rifle.