[stansdds]

The audio is of multiple brownings firing rapidly (approx 2800 Rounds per minute). The exterior audio is fast and gives a (I think) convincing rapid fire, and from the cockpit view it has a deeper bass audio.

Pilots I have talked to have said the 50-cals sounded like a buzz saw. To be honest I tried something like that, but..just couldn't get it right.

Multiple AN/M2's probably did sound like a buzz saw and I'm sure the later AN/M3 must have sounded like one. What many people do not realize is that there are three distinct versions of the Browning M2 50 caliber machine gun.

M2HB = Heavy barrel M2, air cooled heavy barrel for ground use. Rate of fire 450-575 rpm.

AN/M2 = air cooled, lighter barrel for use in aircraft. Rate of fire 750-850 rpm.

AN/M3 = air cooled, lighter barrel with a feed boosting system. Rate of fire 1200 rpm.

The clips seen on YouTube or just about anywhere are of the slow firing M2HB. The 50 calibers used in aircraft were the AN/M2 and had nearly twice the rate of fire. The AN/M3 was developed during WWII and installed in the F-84 Thuderjet/Thunderstreak, F-86 Saber, and used in the XM14/SUU-12/A gun pod used in Vietnam. The P-80, however, used the AN/M2.