Printed AR Lower v5 Review, Defense Distributed official tumblr blog (archive) 3D printed AR lowers holds up 600+ rounds, file ready for download, 3Ders, Feb 28 2013. (archive) AR-15_DefDist_Lower_Receiver_v5
Truy cập ngày 12 tháng 4 năm 2013.  ^ a ă Printed AR Lower v5 Review, Defense Distributed official tumblr blog (archive) ^ 3D printed AR lowers holds up 600+ rounds, file ready for download, 3Ders, Feb 28 2013. (archive) AR-15_DefDist_Lower_Receiver_v5