It's an Industrial Revolution recipe found at the Blast Furnace.
"Irregular crossbow recipe part 2"
R10 Casting
R8 Management (R6 if done at your own nation)
Ingredients:
Stainless Steel x10
Suede x10
Processed Lumber x1
217,800 ducats if Stockpile resources are used to cover part of the ingredient cost
The rest you know. Cheers.
Source: gvo.gamedb.info/wiki/?IndustrialRevolution