$40 FN FAL Battle Rifle R1 variant 3D model by cgd. Available on CGTrader with 35515 polys and 18144 vertices. Check it out on CGHub.
OBJ (OBJ, filesize: 702 KB), HRC (Autodesk Softimage, filesize: 741 KB), MAX (Autodesk 3ds Max, filesize: 1.2 MB), FBX (Autodesk FBX, filesize: 1.13 MB), DAE (Collada, filesize: 736 KB), 3DS (3D Studio, filesize: 510 KB)