This mod was originally on "mw.modhistory.com". But since Nexus has other mods from that site, and it hasn't been updated since 2021, I hope there's no harm posting it here. Credit for this mod goes to CantinaBoy.
Permissions and credits
Credits and distribution permission
Other user's assetsAll the assets in this file belong to the author, or are from free-to-use modder's resources
Upload permissionYou are not allowed to upload this file to other sites under any circumstances
Modification permissionYou must get permission from me before you are allowed to modify my files to improve it
Conversion permissionYou are not allowed to convert this file to work on other games under any circumstances
Asset use permissionYou must get permission from me before you are allowed to use any of the assets in this file
Asset use permission in mods/files that are being soldYou are not allowed to use assets from this file in any mods/files that are being sold, for money, on Steam Workshop or other platforms
Asset use permission in mods/files that earn donation pointsYou are not allowed to earn Donation Points for your mods if they use my assets
Author notes
This author has not provided any additional notes regarding file permissions
This mod is not opted-in to receive Donation Points
From the ReadMe file: The portal to Martilahivan is located on the same island as the Mudcrab Merchant. There is a collection of powder-and-shot firearms there, along with the necessary powder and shot. Your fingers may clip slightly through the gunstocks.