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The SMR MK4 and MK8 were one of the first RIS sistems feature M-LOK technology. Available in multiple lenghts, with fore rails (MK4) or completly modular (MK8). Thez also feature Geissele's proprietary 2.25" long barrel nut. This increases the surface contact where the rail interfaces with the receiver and creates a platform that can be trusted to be straight and true the entire length of the free float rail. This increases accuracy and zero repeatability during disassembly and reassembly when performing maintenance.