Odd lack of underbarrel grenade launcher, as separately available accessory Options

[eidolon]

Anybody else noticed that somewhere between Shadowrun 3 and Shadowrun 4 the description of the Ares Antioch lost the key bit about frequently being mounted under the barrel of other weapons? Am I just critical glitching my Data Search?

I noticed this because for the first time I wasn't just buying one of the weapons that just "has an UGL," like an Alpha or something.

Now, you could look through SR4, SR4A, and AR and think that only the weapons that come with an UGL can have them. Likewise for an underbarrel shotgun.

I've been digging through SR4, SR4A, AR, SR3, and CC for the last twenty minutes, and there's no simple "this grenade launcher is meant to be mounted under the barrel of another weapon" bit of gear. Are you guys just buying stuff like the Antioch and mounting it?