[marktwain]

Belt fed have a lower pitch sound to them. To me its like a “thud” sound. More important the LMG uses a 30 round clip. The shooter was firing 50 rounds at a time. When I first heard it I thought it was an M240 (it might be.) I would say it was an M249. Also, note how long it takes to reload:
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Shooter had Surfire magazines. They are 60 and 100 rounds.

The M249 can use *both* magazines and belted ammo.

But no M249 was found.

Reloading time is not a problem if you have multiple firearms loaded.

[Karl Spooner]

How do you know there wasn’t a M249 found? I didn’t see an inventory or photographic evidence of the weapons.

[Steve Van Doorn]

"Shooter had Surfire magazines."
Yeah i seen those. notice where they were located. On the other side of the freaking room from the window. That isn't a logical place if he expected firing from the window.

If he was only one guy. that ended up firing maybe two weapons. Why did he have what is the count now 23 weapons?
There was a LOT more people involved or it was a show case of weapons.