The M4 Style Spyder Quad RIS Barrel Shroud features 4 - 15 slot Picatinny rails. The Quad Shroud is compatible with the MRX and and MRX Elite. When using this shroud in association with the Spyder 12" CQB Barrel, the Front Shroud Base (31244 - spy-m4a1-fshb) is required (sold separately).
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