Listed below are weapons you can buy to strengthen your Gundam. I will add more later, but this is enough for now.

I will never add signature weapons, like the Atomic Bazooka's, Beam Gattling, Twin Satellite Cannon. When a item is bought it doesn't matter what kind of item it is, if its built into your suit or not, so there is no days off to install the items. Below are links to the types of stores. All information for each sub shop page can be found in the information section of the site, here is a link.

Installations
Ships & Supports
Mobile Weapons
Gundam Armory
Custom