Not that I could find.
Edit: I checked the original source for the Gnome BA, Field Manual: Crusader Clans. That was back when battle armor was still being constructed by fiat, rather than a unified design system, and many suits included some piece of original equipment. Anyway, the FM says 3056 for the introduction of the Gnome with its special missile launcher. The MUL is correct, and errata should be issued for TechManual or anywhere else the Advanced SRM is listed as being introduced in 3058.
...I mean, that's my opinion from what I could find on the subject. I can't make the ruling, I'm not a MUL member or developer. :-[