There's the Search option located at the bottom right of the page, as well as a Search button in the user toolbar at the top right corner of every page.
Your own A-Z Weapons index is one of the best tools available for searching a particular item. Use the various forum sort options (click on column titles) along with the two Search option (the quick at the bottom of each board, and the other on the top of the link bar) to find anything you need.