Well you can find that .x7 files from
First, you NEED Forty Gear 1, Twenty Gear 2, Ten Gear 3, Five Gear 4, and One Gear 5.
After getting all those gears, crafting the weapons would only require One Gear 1.
But to get all those gears, replace the .x7 files.
You can craft Gear 2 and 3 using Gear 1 & Gear 4 and 5 using Gear 2.
Basically. Crafting using..
Gear 1 ~> (1) Gear 2 or (1) Gear 3
Gear 2 ~> (1) Gear 4 or (1) Gear 5
Sorry if I confuse you.