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Ruger AR-556 .223 Rem / 5.56 NATO 16.1" Barrel 30+1 Model 8500 Like New 10 rounds fir FS Ruger AR-556 .223 Rem / 5.56 NATO 16.1" Barrel 30+1 Model 8500 Like New 10 rounds fired thru it. Ruger AR-556 .223 Rem / 5.56 NATO 16.1" Barrel 30+1 Model 8500 Four 30rd Magpul Mags, two 10rd Magpul Mags...