Reference - Campaign Operations p75 for Fist Fire, TechManual p57 for splitting weapons
If a mech had an arm with all actuators (as is required for Fist Fire), and the arm also contained a large weapon split between the arm and the adjacent torso, could it fire the weapon as part of Fist Fire?
I.e., does the part of the weapon that is in the arm qualify for Fist Fire's requirement that the weapon be "in the same arm," or does the part of the weapon not in the arm disqualify it?