i always get a good giggle out of these videos:
http://www.gulfcoastarmory.com/mgvids.html
for what it's worth, a minigun uses up ammo at a rate of about $80 per second. the gun itself can cost you $60,000-$100,000 by the time you're ready to cut loose.
even the cheapest Class III weaponry these days hover in the $1,000 - $4,000 range. magazines and linked ammo can cost you from between $100 to $200+ for enough ammo to last you roughly 2 minutes.
step up into 12.7mm and you're spending $2.00-$3.00 a shot and going through ammo at the rate of $30 a second.
just some typical prices:
B.A.R.:
http://www.gunbroker.com/auction/ViewItem.asp?Item=5949177
M16
http://www.gunbroker.com/auction/ViewItem.asp?Item=5972448
S&W:
http://www.gunbroker.com/auction/ViewItem.asp?Item=6035493
FNC:
http://www.gunbroker.com/auction/ViewItem.asp?Item=5975302
MP5:
http://www.gunbroker.com/auction/ViewItem.asp?Item=5916833
aaaah. some day
enjoy the videos!
obin