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Midwest Industries 15" SP Series M-LOK Rail in black (MI-SP15M), designed to be compatible with suppressors. The SP Series handguard has an inner diameter of 1.75" with an outer diameter of 2.0". The seven sides of M-LOK compatible slots allows for various configurations with rail accessories. The 1913 top rail is T-marked for accessory location. The SP Series handguard comes with a barrel nut, barrel nut wrench, and one polymer rail section.