The final game should have a challenge system that will let players obtain the specific weapons they seek, rather than relying solely on the randomized loot pick up system that's in place. This should be implements for all weapons: common, uncommon, rare, exotic, and legendary weapons alike. A gun customizer should also be added to the Tower so that we can change the gun-site and special ability upgrades for our uncommon/rare/exotic/legendary weapons if we are not satisfied with the site/ability upgrade options that was found with our weapons.