The Gemtech MIST-22TD series of Integrally Suppressed 10/22 barrels, uses a patented G-Core Technology. The MIST-22TD barrel is a great way to keep your rifle compact without adding the extra length of a standard suppressor. It features a 1:16" RH twist for use with commercially available bull barrel stocks, or, specifically engineered for use with the Ruger 10/22 Takedown Rifle (Requires bull barrel style stock/forend for either model).