How to use downloaded weapon models? Easy:1: Open C:\Sierra\halflife\firearms\models2: Then, put your downloaded model files in that folder, BUT, make a backup of the orginal weapon that you are going to replace. 3: If the downloaded weapon comes with a sprite or sounds, open the firearms folder and put them in their specific folder like the one called "sprites " and the other, "sounds." 4: Start up firearms, go to a server, try them, if you dont like them, do the process but put back your OLD model files.(If you dont know what a model file is, it ends in .mdl)