Check out Butterfly knife 3D model on CGTrader for $10. High-quality mesh by ozodbekmahammatov452: 75000 polys, 80000 vertices. Textured.
STL (Stereolithography, filesize: 7.66 MB), OBJ (OBJ, filesize: 9.75 MB), FBX (Autodesk FBX, filesize: 8.56 MB), PLY (Ply, filesize: 3.41 MB), GLTF (glTF, filesize: 7.69 MB), BLEND (Blender, filesize: 172 MB)