Not going to sit here and say that the LBX-AC/10 is flat out better than an AC/10. Though the LBX-AC/10 is a weapon worth using in it's own right. Where the AC/10 is a straight up main weapon, the LBX is a specialist weapon. It can still be used in the same manner as an AC/10 but it starts to shine in the situations where the AC/10 starts to lose it's effectiveness.
Aside from weighing less than an AC/10 by a ton and having a greater range the Scatter can be used to great effect. In a standoff situation it is hurt by that scatter but if you are providing direct fire support for your team it is a favored weapon over the AC/10 in my books. The side profiles on Legs and Arms tend to be quite large on most mechs, meaning you don't lose damage to the scatter and the way math works with the pellets means that you'll strip armor just as fast and mulch the internals faster.
The LBX isn't a favored weapon for coring the CT. It is favored for Legging and mulching through the Twist Meta.
In situations where you aren't making use of the AC/10s range the LBX performs just as well. Having a spare ton means a spare ton of ammo, or armor, or an extra Medium Laser or a whole slew of things with designing a mech.
And the scatter cone that many players rail against make the weapon a better choice than the AC/10 for hitting slim, fast targets. Hitting a Spider with an AC/10 or AC/20 while said Spider is weaving about in an intelligent fashion is a feat that I bet even the best MWO players cannot pull off every single time. And since you more often than not want to Leg them to rob them of their speed, again a favorable weapon.
And it is a lot more reasonable to squeeze an LBX into a light mech than it is to do the same with an AC/10. Even if it is a crazy thought, just think of that juicy rear armor at close range with the boosted internal damage.
Edit:
TL:DR?
The LBX is weaker than an AC/10 at Standoff ranges. The effectiveness of an LBX scales up when you start to consider other weapons on your mech or on the field and the LBX becomes more potent the longer the match goes on. The AC/10 remains static in it's effectiveness.
Edited by SuckyJack, 01 September 2013 - 02:49 AM.