
Other than it looking fantastic, of course.
The fact it has such a high chance to be hit. It is at the LOWEST chance it will ever be hit by a critical hit, because it is crit padded by the other two filled slots (actuators, at 10HP). If it's not protected in the ST, such as that heatsink in the LT, it will have a 100% chance to be struck.
The AC20 has 18 HP, throughout those 10 slots. 1.8HP/slot, so to speak.
Both those actuators have 10HP/crit.
Most ballistics have this problem, being larger weapons, but only having the typical 10 HP. The AC20 is the only AC exception to this rule, having 18 HP. One of four items in MWO which does not have 10 HP (being the AC20, Gauss(5), ECM(3) and the Engine(15), IIRC, all engines, Gauss and ECM suites follow this...but not AC20s.)
However, aside from the engine, Ballistics are the largest pieces of equipment. They also cost a fair bit of tonnage, yet die almost as soon as your structure is penetrated (also due to how FLD and the crit system interact...but that's another discussion).
One simple, not really bandaid solution is simply to, again, increase HP, but by more than marginal amounts. If the AC20 had 50 HP, it would survive a touch longer. That's still only 5 HP/crit, but a fair improvement over the current state.
At or under 15 HP, a Gauss Rifle can one-shot any piece of equipment that's not an AC20 (only 17-20% there) which has 14 armour protecting it. At 50 HP, only the AC20 itself could crit an AC20, 3% of the time (also at 19 or less armour)
Those are pretty forgiving odds.
Whether this should be tied to size, just tonnage or by feel can be debated...but some things should be hardier, IMO.
I'll give placeholder number of
- 50 for the isAC20
- 25 for the isAC10
- 18 for the isAC5
- 10 for the AC2...it's only one slot, but could also stand for an increase due to weighing 6 tons, the heaviest one slot item.

Not exactly the numbers...but a general feel for HP increases.