Check out Saiga12 SBS Full Auto PBR Rigged Low-poly 3D model on CGTrader for $22. High-quality mesh by CGmorph: 9068 polys, 8848 vertices. Rigged, PBR, Textured.
OBJ (OBJ, filesize: 1.36 MB), BLEND (Blender, filesize: 2.23 MB), FBX (Autodesk FBX, filesize: 728 KB), UNITYPACKAGE (Unity 3D, filesize: 88.3 MB), DAE (Collada, filesize: 33.5 MB), GLTF (glTF, filesize: 4.84 MB)