Advanced Design
Your weapon innovation uses the statistics of a level 0 advanced weapon of your choice. It must be common or you must have access to it. You treat this as a martial weapon for the purposes of proficiency.
Pathfinder 2e Database
Your weapon innovation uses the statistics of a level 0 advanced weapon of your choice. It must be common or you must have access to it. You treat this as a martial weapon for the purposes of proficiency.