Check out MP7 Sub-Machingun Low-poly 3D model on CGTrader for $24.48. High-quality mesh by Code-Shadow-man: 32127 polys, 15059 vertices. PBR, Textured, UV Mapped.
OBJ (OBJ, filesize: 428 KB), FBX (Autodesk FBX, filesize: 619 KB), ABC (Alembic, filesize: 362 KB)