GAS Mask PBR Low-poly 3D model is available on CGTrader for $8. Original author: cgtdg. Specs: 38000 polys, 39000 verts.
STL (Stereolithography, filesize: 1.44 MB), OBJ (OBJ, filesize: 1.14 MB), 3DS (3D Studio, filesize: 748 KB), BLEND (Blender, filesize: 4.02 MB), C4D (Cinema 4D, filesize: 983 KB), DXF (DXF, filesize: 2.06 MB), FBX (Autodesk FBX, filesize: 6.51 MB), MAX (Autodesk 3ds Max, filesize: 2.1 MB), TEXTURES (Textures, filesize: 54.8 MB)