Check out Spas-12 shotgun Low-poly 3D model on CGTrader for $5. High-quality mesh by ananaster: 8845 polys, 8182 vertices. PBR, Textured, UV Mapped.
BLEND (Blender, filesize: 2.19 MB), OBJ (OBJ, filesize: 1.12 MB), FBX (Autodesk FBX, filesize: 540 KB), DAE (Collada, filesize: 2.11 MB), ABC (Alembic, filesize: 946 KB)