Odd firearm looks more like a telescope than pistol. Chambered for 10.55mm gas cartridge. Single-shot. Overall approximately 5.5" long in its open or cocked position. Barrel is smoothbore and 3.75" in length. No sights or safety—one simply pulls inner tube back much like extending a telescope, unscrews end cap, inserts round and screws cap back into place. When needed, a thumbnail is used to depress sear and fire pistol. Marked on end cap "Buco DRGM". No more information available as to quantity or year of manufacture.