DD MK18 Rail Interface System II, RIS II 7.0" Rail The Rail Interface System (RIS II) was designed at the request of the United States Special Operations Command (SOCOM) for the SOPMOD II program Features * Free Floating Barrel Design * Uninterrupted Upper Rail Platform * Light weight * Removeable Lower Rail * Aircraft Grade Aluminum * Hardened Steel Barrel Nut Material: Aircraft Grade 6061-T6 Aluminum Finish: Military Specification Type III Hard Coat Anodized Length: 7.0" (7Inch)
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