Check out PBR Turret Gun 06 Purple Low-poly 3D model on CGTrader for $6. High-quality mesh by DaikLord3D: 816 polys, 865 vertices. PBR, Textured, UV Mapped.
MA (Autodesk Maya, filesize: 375 MB), OBJ (OBJ, filesize: 375 MB), FBX (Autodesk FBX, filesize: 375 MB), MAX (Autodesk 3ds Max, filesize: 375 MB), GLTF (glTF, filesize: 375 MB), TEXTURES (Textures, filesize: 375 MB), PNG (PNG, filesize: 375 MB), UNITYPACKAGE (Unity 3D, filesize: 375 MB), UASSET (UnrealEngine, filesize: 375 MB), USDZ (USDZ, filesize: 375 MB), JPG (JPG, filesize: 375 MB)