$7 RDS Sig Sauer Optics Romeo 3 Low-poly 3D model by jackblack1. Available on CGTrader with 1608 polys and 1407 vertices. Check it out on CGHub.
OBJ (OBJ, filesize: 83.3 KB), FBX (Autodesk FBX, filesize: 107 KB), MAX (Autodesk 3ds Max, filesize: 145 KB), TEXTURES (Textures, filesize: 79 MB)