First, find and read the
GunLink Marketplace Rules here.
If you meet the Marketplace requirements (at least 10 posts and your account is not "brand new") and you agree the rules (linked above), post in this thread to request posting access for the marketplace. Alternatively, you can send this account (GunLink) a site PM to request access.
The access process may change in the future (comments? leave them here), but this is how it is for the time being to avoid spam, "drive by posting," etc.
After you your request is approved, you will have access to the
buy /
sell /
trade boards