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BRB, let me check... You need to have your character acquire some regular snowflakes first (which can also be made into a "Snowflake Shuriken")....
I'm 99% sure you need to be using the "Magnetic Crucible". It keeps the more powerful weapons more towards the end-game.
Whelp, I'm back with another bug to report: the "Gullenkambi"'s recepie file says it requires "imperviumbar" instead of "imperviumcompound".
My friend and I have been using this on his server, and I have to say, it's re-balanced combat in the player's favor... by a fair margin. But...
Umm... Some of the guns can't be crafted... they are reading as needing "Perfectly Generic Items" instead of the items you codded the recipe as...