As this aircraft was designed for hauling cargo around, the weapons have been removed.
Activation group 1: drag chute
Activation group 2: Release the front container
Activation group 3: Release the middle container
Activation group 4: Release the rear container
Activation group 5: Toggle the rack lowering mechanism. Press the release weapons key to lower it.

List of uses:
1: Dropping cargo on areas with no runway.
2: Surprise terror attack! Turns out the "cargo was actually bombs :D"
3: Sanctions busting and smuggling! They won't know what you stuffed up in the cargo hold! (And you can easily dump the cargo)
Notes:
While it is merely a simplified version of the bomber, in theory, it could probably be converted to the bomber in a matter of hours. Just stick some bombs into the cabin and call it a day.
The containers are pretty heavy. Uranium smuggling anyone?