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Hi Noah, Yes you need to change the gas block and Yes it is Threaded 1/2-28 ---Manufacturer Number: 55DDF0A 12.5" -- Multi Role Profile -- 4140 Chrome Moly -- Salt Bath Nitride Finish inside and out -- 1:7 Twist -- 5.5645 NATO Chamber -- >>>>>>>Threaded 1/2-28 -- Carbine length gas port -- .750" Gas Journal

Noah, Features of CMMG, Inc 5.56x45mm Nato Mk4 Barrel Sub Assembly - 12.5inch Mr 4140cm Sbn, 5.56mm: 12.5" Multi Role Profile 4140 Chrome Moly Salt Bath Nitride Finish inside and out 1:7 Twist 5.56×45 NATO Chamber Threaded 1/2-28 Carbine length gas port .750" Gas Journal Package Contents: CMMG, Inc 5.56x45mm Nato Mk4 Barrel Sub Assembly - 12.5inch Mr 4140cm Sbn, 5.56mm

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Noah, yes Sir to both ?'s. Gas Block will need changing and this barrel has 1/2-28 threads.