While Armored Core has a healthy retinue of extension parts for just about every pilot’s needs, there are exceptions. And I don’t mean the cut above the rest, like the extension magazines, or those awesome projectile-swatting AMS that’s saved our asses more times than we can count.
I’m talking about the bottom of the barrel; the sort of parts that leave you scratching your heads and wondering WTF was going on the in the dev’s heads when they created them. They’re the sort of parts you’d rather die than equip on your AC (or more probably, you did die when equipped on your AC), and only keep around so you can brag about having a complete garage.