BBs or Paintballs fit in realistic, bullet-sized cartridges that fit in each of the six chambers in the gun. Box of 100 6mm Pellets. Ultra Grade Airsoft Pistol Manufactured by UHC. Quality Heavy Weight Construction - Metal Parts and Antishock ABS. Extremely Realistic in Appearance and Feel. The "L"-frame family of revolvers is one of the youngest and smallest of Smith & Wesson families. It was announced in 1980 with four models, all chambered in .357 magnum - 581, 681, 586 and 686. All those revolvers were similar in design, with differences only in sights and composition. The idea behind the whole "L"-frame family was to create revolvers, strong enough to withstand a steady diet of full-power .357 Magnum ammunition while being comfortable to carry for long periods. Basically, these guns were intended as "ideal" service revolvers in .357 Magnum.