(Answered) Weapon Special Abilities

[Archer_Wirth]

I already asked this somewhere else and received some answers, but I'm not fully satisfied and do not understand why the Alpha Strike rulebook is not concise on this.

I have a 'mech that does 2/2/0 with an AC20. It's special ability is AC1/1/0 - I was explained this was in case I wanted to use any 'special ammo'. Is that all there is to it? - And does it apply across the board to LRM's, SRM's, etc?

[nckestrel]

For AC, LRM and SRM special abilities, their primary purpose is the use to alternate munitions.  There are a few secondary effects (qualifying for special pilot abilities, triggering AMS, how some armor are affected by them).  But alternate munitions is why those three special abilities exist.