Check out robot holding gun Low-poly 3D model on CGTrader for $15. High-quality mesh by best3dmodels: 15000 polys, 17000 vertices. Textured.
STL (Stereolithography, filesize: 1.47 MB), OBJ (OBJ, filesize: 1.93 MB), DAE (Collada, filesize: 4.36 MB), DWG (AutoCAD, filesize: 989 KB), DXF (DXF, filesize: 8.26 MB), IGE (IGES, filesize: 410 Bytes), W3D (Shockwave 3D, filesize: 16 Bytes), 3DS (3D Studio, filesize: 743 KB), FBX (Autodesk FBX, filesize: 6.18 MB), MAX (Autodesk 3ds Max, filesize: 4.24 MB)