I made this a while ago. If someone still uses the older Oculus Touch (Quest & Rift S) controllers, here is a great gunstock system.

Otherwise it would need to be updated for newer controllers. Still I consider the metal pipe to be superior to many other stock mounting systems. You can adjust it on the fly, grab anywhere, detach either or even both hands (if you add a shoulder sling).

The magnets hold on the steel pipe quite firmly but detaches easily with a slight tilt forward or back.

On this version I used magnets that are 13mm x 5mm. I added some wide electrical tape to increase friction. For the right hand there are 3 magnets while the left hand only had 2 to make reloading etc. actions easier.