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Tracy, the H&K MR556A1 uses an HK proprietary keyhole design to allow the attachment of Picatinny rail segments to the hand guard and comes with Troy Micro sights. The H&K MR556LCA1 has a full length Quad Rail hand guard and comes with Heavier duty front/rear Sights. H&K should know the LC nomenclature at Tel: (706) 568-1906
Tracy, the H&K MR556A1 uses an HK proprietary keyhole design to allow the attachment of Picatinny rail segments to the hand guard and comes with Troy Micro sights. The H&K MR556LCA1 has a full length Quad Rail hand guard and comes with Heavier duty front/rear Sights. H&K should know the LC nomenclature at Tel: (706) 568-1906
LC = Loaded Chamber Indicator which is needed to make this firearm legal here in Ca.
The H&K MR556LCA1 has a full length Quad Rail hand guard and comes with Heavier duty front/rear Sights. MR556A1 uses an HK keyhole design to allow the attachment of a Picatinny rail
