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Our best AK arm brace setup is the 9-inch AB-9R arm bar with the AB-BS stabilizer. It is the only JMac rear that can be set up as an arm bar or, with a folding buttplate sold separately, as a stock-style setup. Pick it if you want one rear that can change roles. Pick a skeleton, triangle or tube stock if you want one fixed shape. All of them ride the same JMac mounts. This guide covers fit and setup, not legal classification. What is the JMac arm bar? The AB-9R is a 9" arm bar machined from 707 …