Parts swaping is considered trading. That would fall under BST.
1) No threads will be permitted that contain any offers or requests to buy, sell, or trade equipment (so called “b/s/t” threads). This includes links to any third-party site (Ebay, for example) where equipment is being sold. Any thread which breaks this rule will be immediately closed or deleted and the offender will be issued a warning. Repeat offenders will be banned.
Please read the rules of the forum