$12 Heckler and Koch Gewehr 3 A3 Low-poly 3D model by Antwo3d. Available on CGTrader with 15710 polys and 14894 vertices. Check it out on CGHub.
MA (Autodesk Maya, filesize: 5.17 MB), BLEND (Blender, filesize: 6.03 MB), OBJ (OBJ, filesize: 5.27 MB), FBX (Autodesk FBX, filesize: 6.14 MB), MAX (Autodesk 3ds Max, filesize: 8 MB), UNITYPACKAGE (Unity 3D, filesize: 17.9 MB), TEXTURES (Textures, filesize: 51.6 MB)