Only 4 ever built:

• One lost to a collision while on the ground
• One lost due to shooting it's self down (true story)
• One lost to enemy fire
• One still kicking and restored in the late '90s

5 .50 cal machine guns; 2 20 mm cannons; 2 2.75 in. rocket pods OR 2 7.62 mm gatling guns; 1 40 mm grenade launcher. These things were beasts

http://www.tailsthroughtime.com/2011/02/one-powerful-helicopter-gunship-ach-47a.html

EDIT: The original link didn't seem to work so I've posted a different link to an article about the ACH-47A

Oh ya, and the call sign was "Guns-A-Go-Go"

That's such a great name , "Guns-A-Go-Go", just rolls off the tongue.