M91 30 Mosin Nagant with PU Scope Low-poly (Polygon mesh 3D model) is available on CGTrader for $45. Original author: Plutonius3d. Specs: 2441 polys, 3450 verts.
OBJ (OBJ, filesize: 33.2 KB), WRL (VRML, filesize: 56.7 KB), 3DS (3D Studio, filesize: 43.1 KB), MAX (Autodesk 3ds Max, filesize: 107 KB)