Check out GS-777 Rocket Launcher With Ammunition Low-poly 3D model on CGTrader for $14.5. High-quality mesh by cgtdg: 36000 polys, 34000 vertices. PBR, Textured, UV Mapped.
OBJ (OBJ, filesize: 979 KB), 3DS (3D Studio, filesize: 535 KB), BLEND (Blender, filesize: 16.5 MB), DAE (Collada, filesize: 1.71 MB), DXF (DXF, filesize: 1.54 MB), FBX (Autodesk FBX, filesize: 36 MB), MAX (Autodesk 3ds Max, filesize: 2.27 MB), TEXTURES (Textures, filesize: 196 MB)