Magpul MOE SL Buttstock Mil Spec Low-poly 3D model is available on CGTrader for $12.99. Original author: gunstudio1990.
BLEND (Blender, filesize: 289 MB), BLEND (Blender, filesize: 289 MB), OBJ (OBJ, filesize: 145 MB), FBX (Autodesk FBX, filesize: 289 MB)