AK4 - MachineGun Low-poly 3D model is available on CGTrader for $32. Original author: CGPitbull. Specs: 4600 polys, 4712 verts.
MAX (Autodesk 3ds Max, filesize: 44.5 MB), OBJ (OBJ, filesize: 22.3 MB), FBX (Autodesk FBX, filesize: 22.5 MB), MAX (Autodesk 3ds Max, filesize: 44.5 MB), TBSCENE (Marmoset Toolbag, filesize: 22.3 MB), PNG (PNG, filesize: 22.3 MB), PSD (Adobe Photoshop, filesize: 22.3 MB), TEXTURES (Textures, filesize: 22.3 MB)