[If you listen to the video the 1st five shots were AK rifle shots - followed by three shots from a handgun.]
Its unlikely the human ear can discern what the weapon was that produced the sound impulse without additional info. The recording did not have sufficient fidelity to make a determination berween an AR, AK or pistol. The sound Impulse is approx 165dB at the muzzle for all, depending where the observer is relative to the direction of the bore and whether the muzzle has a break.
Most have seen photos of the Antifa soldier with an AK. Since he was presumably the guy who died, its natural to deduce that it must be an AK. The one video I saw did not clearly show what kind of weapon he was holding. This afternoon in AZ I heard a news report that described the dead mans weapon as a shotgun. Nowhere have I heard the weapon described as a shotgun in any the threads Ive read to dare. I saw a cop place a rifle in his squad car and it was short like an AK or AR carbine, not as long as a shotgun.
I counted two series of shots: 5 and 3. But that is all I know for certain at this point. Im waiting for more stories to come out with corroborating accounts.
I read on another thread that the Austin PD said that the rifle had not been fired. Hard to find out the facts.