Check out SA-9 GASKIN Low-poly 3D model on CGTrader for $5. High-quality mesh by studio3dd: 13096 polys, 37070 vertices.
STL (Stereolithography, filesize: 639 KB), OBJ (OBJ, filesize: 1.42 MB), FBX (Autodesk FBX, filesize: 1.13 MB), DAE (Collada, filesize: 3.26 MB), BLEND (Blender, filesize: 3.47 MB), GLTF (glTF, filesize: 2.15 MB)