This is an AR chambered in 7.62X39mm. This was revealed at Eurosatory 2014 in paris. Yemeni government already placed order to replace AK-47s. It uses Direct Impingement gas system and has AK-like magazine release
http://www.janes.com/article/39666/eurosatory-2014-colt-debuts-ck901-rifle
From: Janes
