$12 Pistol Gun Knife Low-poly 3D model by 3davincileonardo. Available on CGTrader with 4625 polys and 2522 vertices. Check it out on CGHub.
OBJ (OBJ, filesize: 552 KB), FBX (Autodesk FBX, filesize: 179 KB), MAX (Autodesk 3ds Max, filesize: 1.24 MB), 3DS (3D Studio, filesize: 173 KB), DWG (AutoCAD, filesize: 234 KB), SPP (Substance Painter, filesize: 551 MB), ZTL (Zbrush, filesize: 134 KB)