Check out Rifle PBR tetxured Low-poly 3D model on CGTrader for $30. High-quality mesh by rufat-melikov1995. PBR, Textured, UV Mapped.
ZTL (Zbrush, filesize: 33.7 MB), FBX (Autodesk FBX, filesize: 40.1 MB), TEXTURES (Textures, filesize: 33.7 MB), PNG (PNG, filesize: 33.7 MB)