Did you get great Up In Arms (WFRP4 sourcebook)? And you still want more weapons? Ok, so did I. I think number of weapons were missing and decided to create rules for them. My document presents number of stats for different types of weapons. Some are pretty common, others are tools, some are famous from various parts of the Warhammer World, and then few exotic ones with various special rules. Besides new weapons some "old ones" (already presented in the rulebooks) have litte more details/rules.
Expanded Weapon Rules, Version 1.0 (PDF)