Brugger + Thomet original parts kits. Comes with four pieces and is indispensable for any owner's tool box. These PCC carbines are famous for hiccups like throwing extractors ,usually the byproduct of firing out of battery. Will these be available in the future when you NEED one...? Who knows and if you buy a spare - who cares !
https://dlaskarms.com/product/bt-extractor-kit-p-n-bt-kit0011/
https://dlaskarms.com/product/bt-extractor-kit-p-n-bt-kit0011/