{"product_id":"daniel-defense-mk18-ris-ii-quad-rail","title":"Daniel Defense MK18 RIS II Quad Rail for AR-15","description":"\u003cp\u003eThe Daniel Defense MK18 RIS II is a free-float quad Picatinny handguard for AR-15 and M4 rifles, built to the USSOCOM SOPMOD II pattern and bolting on through the six-bolt Bolt-Up System.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eThe MK18 rail as SOCOM specified it — Mil-Spec 1913 on all four faces, two-piece, and free-floating the barrel underneath.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDaniel Defense built the Rail Interface System to USSOCOM's requirements for the SOPMOD II programme, and the MK18 RIS II is the 9.55\" version of it. Every face is Mil-Spec 1913 Picatinny, so lights, lasers, foregrips and pressure pads clamp directly wherever they are wanted with no adapters and no rail sections. The upper rail platform is uninterrupted, and the whole assembly free-floats the barrel for accuracy.\u003c\/p\u003e\u003cp\u003eThe two-piece design is the part that came from the programme: with the lower rail section removed, an M203 grenade launcher can be attached without additional parts and without special tools, because everything needed is integrated into the rail itself. Construction is aircraft-grade 6061-T6 aluminium with Grade 8 military-specification fasteners, finished in Mil-Spec Type III hard-coat anodising in FDE or Black.\u003c\/p\u003e\u003cp\u003eThis is a different generation and a different attachment system from the RIS III. RIS II is quad Picatinny; RIS III is M-LOK. Both use the same battle-tested six-bolt Bolt-Up System, and Daniel Defense made them cross-compatible, but the accessories you already own decide which one belongs on your rifle. On a UK straight-pull AR-15 the appeal of a quad rail is the same as it ever was: a hard mounting point exactly where you want one, on a tube that does not move.\u003c\/p\u003e\u003ch3\u003eWhy shooters choose the MK18 RIS II\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuad Mil-Spec 1913 rails\u003c\/strong\u003e — Picatinny on all four faces, no adapters needed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree-float barrel design\u003c\/strong\u003e — nothing loads the barrel through the handguard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo-piece USSOCOM design\u003c\/strong\u003e — the lower rail section removes so an M203 can be mounted without extra parts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSix-bolt Bolt-Up System\u003c\/strong\u003e — the battle-tested attachment, with Grade 8 Mil-Spec fasteners\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6061-T6 aluminium, Type III hard-coat anodised\u003c\/strong\u003e — the finish Daniel Defense ships on its own rifles\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUninterrupted upper rail\u003c\/strong\u003e — one continuous plane from receiver to muzzle end\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhat the MK18 RIS II fits\u003c\/h3\u003e\u003cp\u003eFits AR-15\/M4 upper receivers on the MK18 pattern, including UK straight-pull AR-15 builds, and mounts through the six-bolt Bolt-Up System onto its steel barrel nut. Rail length is 9.55\" (243 mm) and Daniel Defense specifies a carbine-length gas system; inside diameter is 1.15\" (29 mm), which is tighter than the RIS III, so check your gas block profile before ordering. Unlike the RIS III, this rail has no integrated sling swivel attachment point — add a rail-mounted one such as the \u003ca href=\"\/products\/daniel-defense-rail-mount-qd-swivel-attachment-point\"\u003eDaniel Defense Rail Mount QD Swivel Attachment Point\u003c\/a\u003e, which comes with its swivel. If you would rather have M-LOK than quad rail, the \u003ca href=\"\/products\/daniel-defense-ris-iii-m-lok-handguard\"\u003eDaniel Defense RIS III M-LOK Handguard\u003c\/a\u003e is the current generation.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003ePlatform\u003c\/th\u003e\n\u003ctd\u003eAR-15 \/ M4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFits\u003c\/th\u003e\n\u003ctd\u003eMil-Spec upper receivers, carbine-length gas; steel barrel nut for the Bolt-Up System\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003ctd\u003eFree-float two-piece quad Picatinny handguard, SOCOM SOPMOD II pattern\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e6061-T6 aircraft-grade aluminium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eMil-Spec Type III hard-coat anodised, Black or FDE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e14.1 oz (400 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength\u003c\/th\u003e\n\u003ctd\u003eRail length 9.55\" (243 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMount interface\u003c\/th\u003e\n\u003ctd\u003eMil-Spec 1913 Picatinny on all four faces; six-bolt Bolt-Up System\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eDaniel Defense\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMPN\u003c\/th\u003e\n\u003ctd\u003e01-004-08020-011 · 01-004-08020-006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eQuad rail, SOCOM pattern, free-floated. \u003cstrong\u003eOrder the Daniel Defense MK18 RIS II today\u003c\/strong\u003e — imported from the USA with all duties paid by us and dispatched tracked from the UK in 7–10 business days, with nothing to pay on delivery.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eExplore more:\u003c\/strong\u003e \u003ca href=\"\/collections\/ar-15-parts-accessories\"\u003eAR-15 Parts \u0026amp; Accessories\u003c\/a\u003e or browse all \u003ca href=\"\/collections\/daniel-defense\"\u003eDaniel Defense\u003c\/a\u003e.\u003c\/p\u003e","brand":"Daniel Defense","offers":[{"title":"FDE","offer_id":60873769779534,"sku":"01-004-08020-011","price":669.99,"currency_code":"GBP","in_stock":true},{"title":"Black","offer_id":60873769812302,"sku":"01-004-08020-006","price":669.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1081\/3223\/7646\/files\/daniel-defense-mk18-ris-ii-quad-rail-black-side-view.jpg?v=1790019992","url":"https:\/\/onyxarmaments.co.uk\/products\/daniel-defense-mk18-ris-ii-quad-rail","provider":"Onyx Armaments","version":"1.0","type":"link"}