Check out Weapon NZ SHOTGUN-12G Low-poly 3D model on CGTrader for $25. High-quality mesh by nzbullet-studio: 19598 polys. PBR, Textured, UV Mapped.
BLEND (Blender, filesize: 90.3 MB), OBJ (OBJ, filesize: 1.65 MB), FBX (Autodesk FBX, filesize: 1.4 MB), UNITYPACKAGE (Unity 3D, filesize: 146 MB), TEXTURES (Textures, filesize: 122 MB), DAE (Collada, filesize: 2.7 MB)