The noppans_smg.zip file you have requested: Skins / Weapons / Half-Life 2: Noppans Retextured SMG Weapon Skin (v1.0) - 1.8mb is not available. Perhaps try browsing all files for the game Half-Life 2 and upload any files you want to share or are missing. This is the only information we could locate:
This is a skin for the standard sub machine gun in half life 2 and/or episodes. It has got new textures and color. Enjoy!