This is GUNDAM ASW-G-08 BARBATOS RENOVITO MK II, it's left arm been add with a new armor and armor cannon, while it's shoulder been added a single Third arm that could be folded up, the Right arm could armed with 200mm Gun and Armed Rocket Launcher

(like this one, the 200mm Gun)

and

(this one: The Armed Rocket Launcher)

but it's main weapons, through, of course is the Mace

alongside with the Saw Hammer

(The Saw Hammer)

and the 300mm Smoothbore Gun/60mm Machine Gun

(300mm Smoothbore Gun/60mm Machine Gun)