Too bad beryllium is so toxic. Amazingly light metal, would be a perfect suppressor tube.
For comparison, a steel tube, 1.75" OD, .030 wall and a foot long will weigh 9.09 ounces. The
same tube in titanium will weight 5.07 ounces. A beryllium tube the same size would weigh 2.07 ounces.
Similar strength in pure metal form to mild steel, about 50% stiffer than steel.
But, machining beryllium is extremely hazardous, the fine dust particles can lodge in the lungs causing
a severe allergic reaction. We had machined some beryllium parts in the 80s before this hazard was known, at
the place I worked. A number of workers, mostly cleanup crews, got disability retirement, special health
care for life, and some of our big machine tools got quadruple bagged and shipped to a toxic waste dump
on the chance that dust particles still remained and that any attempts to clean up would risk more particle
dispersion and more injuries.
Neat metal, but not to machine.
Bill