101st Airborne has been issued new M4A1βs since 2012, and the Army has been converting M4s to M4A1s since 2014.
https://asc.army.mil/web/portfolio-item/soldier-m4a1-carbine/
https://www.guns.com/news/2014/05/24/army-infantry-beginning-adoption-of-upgraded-m4a1-carbines
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