?Fluted, 6061-T6 aluminum barrel (0.920″ O.D.) houses a button-rifled chromoly steel liner w/polished 11? angled target crown & 1/2″-28TPI threaded end ?1:16″ twist ?Barrel shanks are slightly oversized to allow for tailored fit on vast array of Ruger? 10/22? & aftermarket 10/22? style receivers ?NOTE: Threaded barrels include flush-fitted thread protector w/matching finish