19.5" stainless steel fluted muzzle-weighted barrel for the 10/22 LR. Unique muzzle design provides better balance. Target grade rifling and modified BENTZ semiauto match chamber for optimum performance and accuracy. 12-flute muzzle contrasts 6-flute barrel for stunning appearance. Muzzle measures 1.06" diameter, rest of the barrel is .920" diameter. Drop-in ready for the Ruger 10-22 .920 bull barrel. Make your 10-22 a winner with the level of performance and quality you've come to expect from Green Mountain.