The ESSS (External Stores Support System) wings are not usually carried on a standard Blackhawk. They are normally only used to carry external fuel tanks for long ferry flights. Some Special Ops varients, like the US Navy MH-60S Knighthawk can carry hellfires and rockets, but normally don't. The only dedicated Blackhawk gunship is the US Army's 160th SOAR (Special Operations Aviation Regiment) MH-60L DAPs (Direct Action Penetrator) and they usually have M134 Miniguns as "doorguns" that are fixed in a forward firing position and can carry a variety of wing stores to include rockets, a 30mm chain gun, hellfires, miniguns, etc. Also, the DAP and MH-60S use shorter ESSS wings with one hard-point on each side, as opposed to the two hard-points on a standard ESSS wing.
MH-60L DAP:
My model of one:
More here.
MH-60S w/ESSS:
The normal "doorguns" for a modern UH-60L now is the M240D MG, which has replaced the M60D MG in US service.
M240D:
Gino P. Quintiliani - Field Artillery - The KING of BATTLE!!!
Check out my Gallery: https://app.photobucket.com/u/HeavyArty
"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf." -- George Orwell