EDEMO JMac Customs AB-9R Arm Bar with Brace Adapter and 1913 Folding Mech 9in Rise AB-9R+AB-BA+FM-SM-1913 EDEMO2. 5mm pin folding stocks. 5.5mm trunnions can be found in the SGL (Saiga) rifles and on the new KUSA KP-9 and KR-9 not to mention the...