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The Daniel Defense Rail Interface System (RIS II) was designed at the request of the United States Special Operations Command (SOCOM) for the SOPMOD II program. It allows the individual operator to free-float the M203 grenade launcher without additional parts. The Daniel Defense RIS II M4A1 FSP features a cut out in the top rail to accommodate a standard front sight base on a carbine length gas system.
Daniel Defense RIS II M4A1 FSP FDE Specifications:
WARNING: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to WWW.P65WARNINGS.CA.GOV
RAIL INTERFACE SYSTEM II M4A1 •Free Float system designed to work in conjunction w/MK12 low profile gas block on an M4A1 or standard M16A4 •Wt.: 17.7 oz. •Length: 12.25” •Width: 2.36” •Armorer Installed •Flat Dark Earth ...
RAIL INTERFACE SYSTEM II M4A1 •Free Float system designed to work in conjunction w/MK12 low profile gas block on an M4A1 or standard M16A4 •Wt.: 17.7 oz. •Length: 12.25” •Width: 2.36” •Armorer Installed •Flat Dark Earth ...