MecArmy TPX8 Tactical Pen
This premium tactical pen features a bolt-action mechanism and a built-in D-ring for attaching to a key ring, a carabiner, or a lanyard. It takes an off-the-shelf LAMY M22 refill and is available in machined titanium or brass. Its top has six slots for DIY installation of 1.5x6mm tritium glow vials.