i have played through Rage already and did not acquire any of the advanced weapons. but i did not know they even existed in the game until i was playin some co-op with my nephew and noticed he had an advanced wingstick?? i have started a new campaign using the fabricator and hope to find the plans to build my own. anyone know where i can get the plans? i have already acquired the advanced pc bomb bu must find the advanced wingstick. the Wingstick is the greatest weapon in the game.

You buy those from vendors often times, I think you get the wingstick one from the shop in Subway (eat fresh) town.

most of the advanced schematics are in the subway town shop , wingsticks, sentry bot, turret

How did you miss this? Did you just not buy schematics at all? I don't understand.