So if you are like me you are always asking, where are the weapon parts at?
Here is how I got a quick 50 weapon parts for 13 motes per weapon.
Grab your weapons core (obtained from PoE) then buy the weapons from veriks to get those legendary guns, then use motes to upgrade the weapon to max (don’t actually upgrade the gun just max the green bar.) , if you have a class item that has X weapon upgrades faster equip it.
This nets 6-8 weapon parts per disassemble + motes and some random things