Check out 12 7mm Browning Machine Gun 50 cal 3D model on CGTrader for $5. High-quality mesh by mrzbadnews: 1444 polys, 1541 vertices.
C4D (Cinema 4D, filesize: 405 KB), BLEND (Blender, filesize: 1.01 MB), OBJ (OBJ, filesize: 207 KB), FBX (Autodesk FBX, filesize: 73.6 KB), 3DS (3D Studio, filesize: 79.1 KB), STL (Stereolithography, filesize: 131 KB)