Check out MP5K MP5KN with Scope Mount Low-poly 3D model on CGTrader for $39.99. High-quality mesh by sztigran: 20000 polys, 17000 vertices. PBR, Textured, UV Mapped.
MA (Autodesk Maya, filesize: 6.05 MB), BLEND (Blender, filesize: 9.08 MB), FBX (Autodesk FBX, filesize: 4.22 MB), MAX (Autodesk 3ds Max, filesize: 4.17 MB), OTHER (Other, filesize: 42.3 MB), PNG (PNG, filesize: 105 MB)