AR15/M16 Fluted Barrel 223 Remington Fluting under the handguard and in front of the gas block Bull barrel profile 1-9 twist 416R stainless steel construction Rifle length gas system on 20 model 0.750 OD at the gas port Post-ban, non-threaded muzzle Crowned muzzle. from Brownells (Product 231-000-341WB)

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