All credit goes to Rhys davey-Radex141 (https://www.thingiverse.com/radex141/designs) for his great design. In his profile you can find quite cool designs, I advise you to take a look.
Remix of the original design for VFC buffer tube and maybe others...
(You may have to use horizontal expansion).
| VFC_Buffer_tube_tool.stl | 136.5KB |
