$39.99 Sci-Fi Turrets pack Low-poly 3D model by Shumn1y. Available on CGTrader with 7777 polys and 3333 vertices. Check it out on CGHub.
FBX (Autodesk FBX, filesize: 16.9 MB), MA (Autodesk Maya, filesize: 16.9 MB), UASSET (UnrealEngine, filesize: 440 MB), OTHER (Other, filesize: 243 MB), UNITYPACKAGE (Unity 3D, filesize: 286 MB)