Summary

Model is 2CM diameter. Probably will need some tweaking. Squeeze together with Vice-Grips or with impact.
Permanent sheet goods joiner. Could render guns inoperable. Drilling out could be messy. Confirm weapon is not loaded.
Very hard to remove when made with the right materials.
Made in 3DOrchard See how fast it can be in your hand. Better smarten up peeps!
https://3dorchard.com/app/single/58ada3108bd9f40c54d40fbe/58b1b71d8bd9f40c54d41021