As far as I know MR556 only comes with 16" barrels so if you want a pinned 14.5 barrel you will have to get some barrel work done on it. And the 16" barrel length isnt only CA compliance, its Federal. Two big names in getting barrel work done on the MR556 right now(as far as I know) is Jayson at IGF(having mine done by him) and Marvin at Nefarious Arms. Either of them can cut it down to 14.5 and pin a muzzle device for 16" overall.
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