The Cloak Industries MFR 56 Belt Fed Complete Upper Receiver converts a standard AR-15 into a belt fed, semi-automatic rifle with no permanent modifications. FeaturesQuick change barrel with CrMo steel Nitride finish2 position gas blockShort-Stroke Gas Piston OperationDual feed design allows use with both Magazine and Belt FedMil Spec Rail IncludesComplete upper with 2 position gas block and handle1-100 round plastic sack100 links with starter tabCleaning kitH3 Buffer and springExtended Bolt catch and Magazine catchFlip up style iron sitesSlingSavior double Rifle Bag