[quote=@Sophrus]
[@Aristo]

So.. let me double check, cos im not sure i understand.

an MP21-AC Handau 
Power: 140
Weight: 85
if using the armament of 
2x AFC-40/L Autocannon
MGR-2A Anti-tank Missile
(which is 36 weight)

with all that we are talking 131 power consumed yes?

[/quote]

So the FRAME has 140 power; it also has 85 weight. The weight of everything attached to a FRAME (including the FRAME's own weight) is subtracted from the power value.

140-85 = 55.

The weight of the equipment totals 36 (8+8+20)

55-36 = 19. The FRAME has 19 unused weight points and consumes 121.