Shield and Concussion Turret Low-poly 3D model is available on CGTrader for $15. Original author: msgamedevelopment. Specs: 2300 polys, 2500 verts.
OBJ (OBJ, filesize: 157 MB), FBX (Autodesk FBX, filesize: 157 MB), TEXTURES (Textures, filesize: 157 MB), PNG (PNG, filesize: 157 MB), UNITYPACKAGE (Unity 3D, filesize: 162 MB)