The Gemtech MIST-22TD series of Integrally Suppressed 10/22® barrels. Using Gemtech's patented G-Core™ Technology" we have created a lightweight" easily maintained" and unbelievably quiet package. The MIST-22TD barrel is a great way to keep your rifle compact without adding the extra length of a standard suppressor. MIST barrels use a match grade 22LR chamber. They feature a 1-16" RH Twist" the MIST-22TD is specifically engineered for use with the Ruger® 10/22 Takedown® Rifle (Requires bull barrel style stock/forend for either model)." with either MIST-22 barrel the Absolute Sound Level is 114dB.