Tactile Turn Bolt Action Pen in copper, Short 5.1" (10-BA2-COP-TTM). Official listing is copper with an all-metal bolt-action mechanism and a stainless steel deep-carry clip. Official specs: 0.43" diameter, 5.1" long, 2.1 oz, Schmidt EasyFlow 9000 refill. Official page lists copper as naturally antimicrobial, with a patina that darkens with use. Machined in Dallas, TX. Specs from the tactileturn.com Copper Bolt Action Pen page.
Copper Short. Parker-style refill. This is the 5.1" length.