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RE: OSINT exercise - Mandalay Bay Casino Shooting
When I first heard it I was thinking either the supersonic bullet sound issue as described below or also sounds reflecting off of nearby buildings.
I also tend to agree with those who think it was a belt-fed mg, going by the sound.
At first, I thought it was either a B.A.R. or a belt fed M-1919 machinegun because of the slow cyclic rate of automatic fire. But, when I found out that at least several of his rifles had bumpfire stocks, that explains the slower cyclic rate of fire. It takes longer between shots with a bumpfire stock because of the way it works.