Check out Multibarrel Short Barrel Revolver 04 Low-poly 3D model on CGTrader for $45. High-quality mesh by OlegShuldiakov: 808 polys, 1000 vertices. Textured, UV Mapped.
OBJ (OBJ, filesize: 1.17 MB), FBX (Autodesk FBX, filesize: 1.17 MB), MAX (Autodesk 3ds Max, filesize: 1.17 MB), MA (Autodesk Maya, filesize: 1.17 MB)