AIR ARMS S510 TC (TWICE) Description
.177, .22, or .25 cal., PCP, SL repeater, 10 shot mag., side by side twin cylinders (TC), 5 stage clickable power adjuster, 15.5 (carbine) or 19.5 (rifle) in. fully shrouded barrel, internal baffle sound moderation, 1050/920/850 FPS, adj. two-stage trigger, built-in manometer, trigger mounted safety, Brown or Hunter Green poplar ambidextrous Monte Carlo stock with dual raised cheekpiece, blue finish, 37.25-44.25 in. OAL, 7.7 lbs. New 2011.
While "TWICE" is marked on the breech, the official model name from Air Arms is S510 TC (twin cylinders).