Check out FN Five-seveN Gun Low-poly 3D model on CGTrader for $15. High-quality mesh by 3davincileonardo: 4311 polys, 4860 vertices. PBR, Textured, UV Mapped.
OBJ (OBJ, filesize: 530 KB), 3DS (3D Studio, filesize: 439 KB), FBX (Autodesk FBX, filesize: 414 KB), MAX (Autodesk 3ds Max, filesize: 1.53 MB), ZTL (Zbrush, filesize: 124 KB)