Check out Handgun set Low-poly 3D model on CGTrader for $2. High-quality mesh by saruemon. PBR, Textured, UV Mapped.
FBX (Autodesk FBX, filesize: 259 MB), MA (Autodesk Maya, filesize: 259 MB), UNITYPACKAGE (Unity 3D, filesize: 259 MB), MEL (Maya Mel Script, filesize: 259 MB), TEXTURES (Textures, filesize: 259 MB), PNG (PNG, filesize: 259 MB)