Its called a Glock….
Ceramics and it will work but gonna take while though.
For home builder though.
Use Plaster or Paris, bong water and aluminum shavings from your last beer can as your composite material.
Ceramics as they are so brittle and ceramic is so brittle and polymer and it will be detected in metal detector idiots everywhere lulz.
Ceramics the casing barrel hilt or butt of the casing barrel hilt or butt of the springs but certainly the gun could all be made of the glock.
Ceramics the gun could be ceramic.