EDEMO JMac Customs AB-9R Arm Bar with Brace Adapter for 4.5mm Folding AKs 9in Rise Black AB-9R+AB-BA+SM-4.5 EDEMO1. This version of the SM stock/brace adapter is specifically made for 4.5mm pin folding stocks. 4.5mm trunnions can be found in the SLR...