{"product_id":"ris-ii-m4a1-fsp-assembly-black","title":"Daniel Defense RIS II M4A1 FSP Assembly – Free-Float Rail System","description":"\u003cp\u003eThe Daniel Defense RIS II M4A1 FSP Assembly is a mil-spec free-float rail system designed for carbine-length gas systems with a front sight post. Originally developed for USSOCOM, this quad-rail handguard provides a stable mounting platform for lights, lasers, and vertical grips while maintaining consistent point-of-impact. The continuous top rail allows co-witnessing with fixed iron sights and maintains zero when accessories are removed and reinstalled.\u003c\/p\u003e\u003cp\u003eCNC-machined from 6061-T6 aluminum with a Type III hard-coat anodized finish in black. Includes barrel nut, hardware, and installation wrench. Compatible with AR-15\/M4 carbines with front sight posts and carbine-length gas systems. Does not require proprietary tools for installation beyond standard armorer's tools.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Free-float quad rail\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Firearms:\u003c\/strong\u003e AR-15\/M4 carbine with front sight post, carbine-length gas system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 6061-T6 aluminum, Type III hard-coat anodized\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRail Spec:\u003c\/strong\u003e MIL-STD-1913 Picatinny (four sides)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Rail assembly, barrel nut, mounting hardware, installation wrench\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse:\u003c\/strong\u003e Accessory mounting, enhanced weapon modularity\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Daniel Defense","offers":[{"title":"Default Title","offer_id":47950706573567,"sku":"DD0100408030006","price":538.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/dd0100408030006.jpg?v=1766721765","url":"https:\/\/doublestackstore.com\/products\/ris-ii-m4a1-fsp-assembly-black","provider":"Double Stack Store","version":"1.0","type":"link"}