Check out MP5A2 MP5SD2 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: 6.08 MB), BLEND (Blender, filesize: 9.07 MB), FBX (Autodesk FBX, filesize: 4.18 MB), MAX (Autodesk 3ds Max, filesize: 4.98 MB), OTHER (Other, filesize: 43.6 MB), PNG (PNG, filesize: 105 MB)