The mini gun in the live action video fires about 80 to 100 rounds of 7.62x51 (also known as a 308) per second. The cheapest I was able to find 308 rounds online was $679 per 1k (can get a little cheaper if you purchase steel cased rounds). He fired for about a minute straight so about 6k rounds or $3800 of ammo not counting the links to put them together or the labor to link them. So maybe I was wrong in my first assessment but still $4k to shoot for a little over a minute? He has a better job than I do. I am a bit jealous though.

This assumes I IDed the gun correctly, however it looks to me like an M134.

I wonder if we'll ever see a man-portable (ultralight) turbolaser to allow infantry to hurt vehicles. Something equivalent to the WH40K lascannon.I'm thinking something with more damage and penetration (either high Pierce or Breach 1) than a heavy repeating blaster without Autofire and likely with Slow-Firing 1 (or 2).

I wonder if we'll ever see a man-portable (ultralight) turbolaser to allow infantry to hurt vehicles. Something equivalent to the WH40K lascannon.I'm thinking something with more damage and penetration (either high Pierce or Breach 1) than a heavy repeating blaster without Autofire and likely with Slow-Firing 1 (or 2).

Well, in the old Clone Wars animated series, during the first episode of the second half, there was an ARC Trooper that was sporting a chest-mounted quad laser cannon not unlike what was mounted on the Falcon. Granted, said gun is now in the Legends category.

http://starwars.wikia.com/wiki/Reciprocating_quad_blaster

In terms of sanity-based mechanics, you could probably just use the stats for a Heavy Repeating Blaster. Combine with a Strength Enhancing System attachment for the armor, the Weapon Harness attachment for the weapon itself, and a couple ranks of Burly and you're off to the races. Just hand wave the "second crewman" for the power generator and figure that's incorporated into the weapon itself.

Or you could ditch the "approach this from a sane and mechanically-balanced angle" completely and just use the auto-blaster stats and figure that the special harness allows the user to ignore the Silhouette 2 requirement from pg271. This would make the weapon dangerous against vehicles, but the way ranged combat generally works in this system it'd still be a nightmare for foot troops even with autofire.