I am sort of surprised that by 2860 all the Clan tech we know and love at invasion time is available. Actually if you discount the last three (Targeting Computer, A-Pod, Arrow IV) that date is more like 2832. So essentially within ten years of the conclusion of Operation Klondike (the liberation of the Pentagon Worlds) most everything is available to the Clans. Golden Century is more like the Diamond Decade. The InnerSphere of the 3rd Succession War is so lucky the Clans didn't invade in 3000 cause it would have been impossible to stop them with 3025 (Level 1) tech.
The amount of canon contradictions also surprises me. I can sort of understand someone forgetting about the Cloud Cobras being the masters of laser technology (FM Warden Clans) then having not a one discovery in that field or the Ice Hellions innovating Ferro Fibrous and Endosteel (from FM Crusader Clans). They are older sources and maybe are a little too boastful about the acheivements of their own Clan.
However, both the Anti-Missile System (changed from Blood Spirit to Star Adder) and the Narc Missile Beacon (changed from Hell's Horses to Ice Hellion) between Golden Century PDF to Strategic Operations. Not a big gap and readily available.