Check out MP5A5 MP5SD6 with Silencer Scope Mount Rail Grip 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: 6.65 MB), BLEND (Blender, filesize: 9.88 MB), FBX (Autodesk FBX, filesize: 4.57 MB), MAX (Autodesk 3ds Max, filesize: 5.33 MB), OTHER (Other, filesize: 44.1 MB), PNG (PNG, filesize: 105 MB)