Cmmg barrel w/bolt kit 9mm 8″ rdb black FEATURES:8″ Medium Taper 1:10 Twist 4140 Chrome Moly Salt Bath Nitride Finish inside and out 9×19 NATO Chamber Threaded 1/2-28 Radial Delayed Blowback Bolt Requires enlarged ejection port for reliable operation Weight: 1.7lbs Other Features: Medium taper, 1:10 twist, 4140 chrome moly, salt bath nitride finish, threaded….