Battle-Tested, 6-Bolt Bolt-Up System . The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. Mods . From: $476.00. Low profile gas block, carbine length gas system; Daniel Defense M4A1 RIS II handguard, milled from 7075 T6 aluminum; 3 low profile Santoprene rail ladders; 6 position mil-spec receiver extension; Daniel Defense buttstock and pistol grip with soft-touch overmolding; Overall length 31.5" to 34.75" Weight 6.74 lbs; Mil Spec+ Cerakote; Looking for . This is due to various clearance issues. The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. KEY FEATURES. This rifle also comes with the newly . VFC Daniel Defense MK18 RIS II Free Float Picatinny Rail for M4/M16 Airsoft Rifles . View + Model Options. The MK4 and MK8 internally are like the Carlsbad caverns. . Equipped with 4 mounts for installation of additional devices and accessories. NFA DISCLAIMER Once this part is assembled into a complete firearm, it becomes a regulated item by the National Firearms Act (NFA). . Daniel Defense RIS II M4A1 Blk Rail Interface System Assembly 01-004-08001-006. The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. As a result Daniel Defense is able to offer this gas block commercially. Daniel Defense MK18 AR-15 5.56 NATO/.223 REM Semi-Auto Pistol Bereli.com has the best deals on the web for ammunition, firearms, tactical gear & more. Hardened 416 Stainless Steel Black Oxide Coated Precision CNC Machined The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. The Daniel Defense RIS II allows the individual operator to free float the M203 grenade launcher without additional parts. Free-Floating Barrel Design For Increased Accuracy. If OP is sure he wants to stick with this rail no problem. Made with light but durable aircraft aluminum alloy. M-4A1 Sopmod Block 1 FSB Upper. The M4A1 AR15 style firearm features the RIS II picatinny quad rail, which has been in use by US Special Operations Command (SOCOM) for the SOPMOD Block II program since 2005. . The Daniel Defense RIS II allows the individual operator to free float the M203 grenade launcher without additional parts. Description The MK12 Gas Block is only compatible with the RIS II (M4A1 & MK18) family of rail systems manufactured by Daniel Defense. Free-Floating Barrel Design For Increased Accuracy. KEY FEATURES Aircraft Grade 6061-T6 Aluminum Free-Floating Barrel Design For Increased Accuracy Two-Piece Design for USSOCOM Allows For the Attachment of an M203 Grenade Launcher When Lower Rail Section is Removed. MFG Part #: 815604015547. Shop EMG Colt Licensed Daniel Defense M4A1 SOPMOD Block 2 Airsoft Gun | Up to $10.99 Off 4 Star Rating on 1 Review for EMG Colt Licensed Daniel Defense M4A1 SOPMOD Block 2 Airsoft Gun + Free Shipping over $49. EMG / Daniel Defense Licensed SOPMOD Block II w/ GATE ASTER Programmable MOSFET (Model: M4A1 RIS II / Black) Displaying 16 to 17 (of 17 reviews) Aircraft Grade 6061-T6 Aluminum; . The Daniel Defense RIS II allows the individual operator to free float the M203 grenade launcher without additional parts. BD Eotech G33 magnifier 3x. . $119.99. Daniel Defense MK12 Low Profile Gas Block (MK12) is a gas block in Escape from Tarkov . Little did I know it would take over two years to collect all the bits and pieces. Daniel Defense AR15 RIS II Picatinny Quad Rails | Daniel Defense View Compared 0 RIS II Rail Looking for something specific? The 14.5" Cold Hammer Forged M4 barrel houses a permanently attached Daniel Defense Flash . The Daniel Defense RIS II 12.25 foregrip is a part of the SOPMOD Block II program to replace the standard M4CQBR or Mk18 foregrips in the US SOCOM service. That's fine but the MK12 is larger than many standard low pro gas blocks. x1 30 Rnd Magazine. MSRP: $795.00 . PTS Gogun Gas Pedal. DANIEL DEFENSE MK18 AR15 10.3" SBR UPPER BLACK RIS II RAIL for sale online. KEY FEATURES. CA-Legal Fixed Magazine Rifle, includes 10 round magazine. The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. As important, special tools are not required to mount the M203 grenade launcher. The handguard is the Daniel Defense RIS II MK18 model. The Daniel Defense RIS II allows the individual operator to free float the M203 grenade launcher without additional parts. Ich habe die Cyma neu gekauft und das RIS gegen das selbe ich braun getauscht. The Daniel Defense RIS II 9.5 foregrip is a part of the SOPMOD Block II program to replace the standard M4CQBR or Mk18 foregrips in the US SOCOM service. The Daniel Defense RIS II free-floating Picatinny rail systems are designed to allow individual operator to quickly, and without special tools, mount M203 Grenade Launcher and precisely mount SOPMOD accessories to host weapon without effecting point of . 22 (100%) Originally Posted by Iraqgunz. Trying to figure out if there are others who run another adjustable gas block underneath their RIS ii rail ? The Daniel Defense RIS II free-floating Picatinny rail systems are designed to allow individual operator to quickly, and without special tools, mount M203 Grenade Launcher and precisely mount SOPMOD accessories to host weapon without effecting point of . As important, special tools are not required to mount the M203 grenade launcher. CNC machined Daniel Defense licensed RIS II aluminum alloy handguard with laser etched trademarks and one piece outer barrel . 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. The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. A2 Bird Cage Flash Hider Rail System: RIS II MK18 Low Profile Gas Block Weight: 3lbs 8oz . Free-Floating Barrel Design For Increased Accuracy. Provides barrel free-float and expanded accessory mounting . It is not compatible with any other Daniel Defense rail system. BD Eotech XPS3-2. The DD RIS is a classic. The Daniel Defense Rail Interface System (RIS II) was designed at the request of the United States . Muzzle Device: Knights Armament NT4 Flash Hider, Surefire Socom 4 Prong Flash Hider. As important, special tools are not required to mount the M203 grenade launcher. Plus, these ingenious handles are designed with our anti-gas feature to keep gas away from your face and provide a better shooting experience. This is the rail used for an authentic M4A1 block 2 straight rail build. The DD5 V3 builds upon the foundation Daniel Defense established in 7.62 AR-style rifles. The Daniel Defense M4A1 features the M4A1 RIS II, which has been in use by US Special Operations Command (SOCOM) for the SOPMOD II Weapons System since 2005. Two-Piece Design for USSOCOM Allows For the Attachment of an M203 Grenade Launcher When Lower Rail Section is Removed. Vote. If you are mounting the gas block . Battle-Tested, 6-Bolt Bolt-Up System Securely . KEY FEATURES Aircraft Grade 6061-T6 Aluminum Details The Daniel Defense M4 URG, MK18 comes complete with bolt carrier group and charging handle, 10.3 Cold Hammer Forged Barrel, RIS II MK18 Rail System, and Daniel Defense low profile gas block. PRODUCT DESCRIPTION. The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. Aircraft Grade 6061-T6 Aluminum; Battle-Tested, 6-Bolt Bolt-Up System . Occasionally, we get these as part of a total assembly, and thus are "new take-offs", but most of the time we get the virgin barrel and then pin the gas block to the barrel. We also have been given exclusive rights to distribute top tier gel blasters products from Kublai and LDT, delivery excellence and value to the gel blaster community x1 BB Loader. Free-Floating Barrel Design For Increased Accuracy. As important, special tools are not required to mount the M203 grenade launcher. . Das RIS wurde l. Recommended for the GHK - Colt M4A1 Daniel Defense RISII GBBR Gas Blow Back . The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. As important, special tools are not required to mount the M203 grenade launcher. Material-Metal. KEY FEATURES. The Daniel Defense RIS II free-floating Picatinny rail systems are designed to allow individual operator to quickly, and without special tools, mount M203 Grenade Launcher and precisely mount SOPMOD accessories to host weapon without effecting point of . [WTS] Daniel Defense MK18 RIS II Rail in FDE (NC) G&S ONLY OR MUST USE PROXY. Posted by. Inokatsu COLT M4 CQBR Gas Blowback Rifle (Customized to Use Modified GHK Gas Magazine) $928.00. EMG / Daniel Defense Licensed M4A1 SOPMOD Block II Gas Blowback Airsoft Rifle . Night Evolution Dual Pressure pad switch. MATERIALS & CONSTRUCTION. I'm not fully back to how I was pre-surgery, but I'll be needing a . This only applies to rail system lengths that would completely shroud the gas block. GAS SYSTEM: Pinned Low Profile Gas Block CNC Machined of 4140 hardened steel with Mil-Spec Heavy Phosphate Coating, Carbine length, Direct Impingement HANDGUARD: Daniel Defense M4A1 Rail Interface System (RIS) II, CNC Machined of 6061-T6 Aluminum, Type III Hard Coat Anodized FDE 852548002561. details. The gas system is made up of the set screw Torx . Aircraft Grade 6061-T6 Aluminum; Upper Receiver Assemblies, Gas Block Barrel Dimpling, Pin And Welds, A2 FSB Barrel Cuts, Gas Block Pinning, and General Help (WA) Howdy, y'all. 01-004-08001-006. The M4A1 is built around a 14.5 inch Cold Hammer Forged M4 Profile barrel with a permanently attached Daniel Defense Flash Suppressor. Daniel Defense 0208815126011 DDM4 M4A1 5.56x45mm NATO 14.50" 30+1 Mil-Spec Brown Cerakote 6 Position w/SoftTouch Overmolding Stock. . 10.3" 5.56MM, CARBINE, 1:7, GOV. Bolt Carrier Group: Colt, FN. This is due to various clearance issues. The GHK Colt M4A1 RIS II is also the SOPMOD Block 2 which is widely used by special operations forces in the United States military in different theaters around the world.? The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. Colt Receiver with Daniel Defense M4A1 RIS-II FDE rail This is a custom made M4A1 URG with a 14.5" pinned and welded barrel, with Surefire Warcomp SOCOM extended flash hider for an overall 16" non-NFA setup. Hand Guard: Daniel Defense M4A1 RIS II FDE FSP/Non-FSP. Aircraft Grade 6061-T6 Aluminum; As important, special tools are not required to mount the M203 grenade launcher. SHARE THIS Description Reviews Additional Info Product Description Daniel Defense M4 URG MK18 FDE Eurooptic and 1 more offer. MATERIALS & CONSTRUCTION. OUT OF STOCK BOLT . KEY FEATURES. Daniel Defence RIS II 12.25 foregrip is a part of the SOPMOD Block II program to replace the standard M4CQBR or Mk18 foregrips in the US SOCOM service. Aircraft Grade 6061-T6 Aluminum; GAS SYSTEM: Pinned Low Profile Gas Block CNC Machined of 4140 hardened steel with Mil-Spec . x1 Manual. details. The Daniel Defense RIS II allows the individual operator to free float the M203 grenade launcher without additional parts. The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. FSP RIS II models have a cutout in the top rail that allows retention of the standard A2 gas block/front sight tower on a carbine-length gas system. The M4A1 is built around a 14.5 inch Cold Hammer Forged M4 Profile barrel with a permanently attached Daniel Defense Flash Suppressor. The MK12 block is a low profile design and smaller than a Geissele block. Two-Piece Design for USSOCOM Allows For the Attachment of an M203 Grenade Launcher When Lower Rail Section is Removed. Ambidextrous GRIP-N-RIP charging handles provide a secure grip and even more flexibility for right- and left-handed shooters. Battle-Tested, 6-Bolt Bolt-Up System Securely . This was accomplished by integrating all of the needed parts to free float the M203 into the rail itself. Magpul RVG grip. The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. The M4A1 AR15 style Upper Receiver Group features the RIS II picatinny quad rail, which has been in use by US Special Operations Command (SOCOM) for the SOPMOD Block II program since 2005. Its free-floating Picatinny rail systems are designed to allow the individual operator to quickly, and without special tools, mount a M203 Grenade Launcher and precisely mount SOPMOD accessories to host weapon without effecting point of impact. The Daniel Defense RIS II is an innovative upgrade to the M4 platform and is available for commercial purchase directly from Daniel Defense or any authorized distributor. $465.00 - $635.00 EMG / Daniel Defense Licensed SOPMOD Block II w/ GATE ASTER Programmable MOSFET . The Daniel Defense RIS II free-floating Picatinny rail systems are designed to allow individual operator to quickly, and without special tools, mount M203 Grenade Launcher and precisely mount SOPMOD accessories to host weapon without effecting point of . . Daniel Defense AR15 Gas Blocks | Daniel Defense View Compared 0 Gas Blocks Looking for something specific? GAS SYSTEM: Pinned Low Profile Gas Block CNC Machined of 4140 hardened steel and Mil-Spec Heavy Phosphate Coating, Carbine length, Direct Impingement HANDGUARD : Daniel Defense M4A1 Rail Interface System (RIS) II, CNC Machined of 6061-T6 Aluminum, Type III Hard Coat Anodized FDE Designed around a Cold Hammer Forged . RWA Fortis SWITCH 556 Rail System - 14 inch KeyMod Black for M4 AEG & GBB Series. The M4A1 features a 14.5" Cold Hammer Forged M4 Profile barrel with a permanently attached Daniel Defense Flash Suppressor. The rails come in black or FDE. Filter Show In-Stock Products Only 6 items MK18 Rail Interface System II, RIS II (Black) $476.00 View MK18 Rail Interface System II, RIS II (FDE) $476.00 View M4A1 FSP Rail Interface System, RIS II (Black) $476.00 View . The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. Key Features: Aircraft Grade 6061-T6 Aluminum. The MK18 is a 10.3 inch short barreled AR-15 made by Daniel Defense. Gas Blowback Rifles; Gas Rifles (Non-Blowback) HPA / Electro-Pneumatic; Machine Guns; Airsoft Shotguns; . Gallery DD4 RIII (16" Barrel) 16" Barrel 12.5" RIS III Rail 6.52 lbs The Daniel Defense M4 URG, MK18 comes complete with bolt carrier group and charging handle, 10.3 Cold Hammer Forged Barrel, RIS II MK18 Rail System in Flat Dark Earth, and Daniel Defense low profile gas block. Aircraft Grade 6061-T6 Aluminum. FEATURES Aircraft Grade 6061-T6 Aluminum Free-Floating Barrel Design For Increased Accuracy Two-Piece Design for USSOCOM Allows For the Attachment of an M203 Grenade Launcher When Lower Rail Section is Removed. Thanks Hop-up-ADJUSTABLE. This foregrip option is incompatible with 203 UBGL. It is CNC machined of 6061-T6 aluminum, and type III hard coat anodized, Flat Dark Earth. Tokyo Marui MK18 Mod.1 ZET System Gas Blowback Rifle (Cerakote Coating) Features:-High quality CNC finished cast aluminum receiver with licensed Colt rollmarks-EMG Daniel Defense-licensed MK18 RIS II handguard-Tokyo Marui ZET System with improved gas efficiency and durability-Licensed Colt trademarks-Removable flip up GAS SYSTEM: Pinned Low Profile Gas Block CNC Machined of 4140 hardened steel with Mil-Spec Heavy Phosphate Coating, Carbine Length, Direct Impingement . by SOFREP Sep 10, 2019. Features Free Floating Barrel Design Uninterrupted Upper Rail Platform Aircraft Grade Aluminum Hardened Steel Barrel Nut Grade 8 Military Specification Fasteners Systema PTW Challange KIT M4 CQBR. Z-Parts MK16 Barrel (Steel, DD GOV 10.3 inch) for VFC M4 GBBR Airsoft - Black. . Aircraft Grade 6061-T6 Aluminum. GHK COLT M4A1 Daniel Defense RIS II FSP GBBR. This is a new Daniel Defense barrel, along with everything you need to install into a DD RIS-II Mk18 rail. This gas block is built to Crane specification for USSOCOM. KEY FEATURES. $103.99. The perfected bolt carrier group reduces overall recoil impulse and is easy to maintain and operate in all conditions. Huhu, Zum Verkauf habe ich hier ein Block II RIS von Cyma. It's made with light but durable aircraft aluminum alloy and comes equipped with 4 mounts for the installation of additional devices and accessories. . Charlie's Custom Clones offers the SOPMOD Block 2 in this configuration of the straight rail, and also the FSP with the front sight base. UPPER RECEIVER: Mil-Spec with Indexing Marks and M4 Feed Ramps. FEATURES. KEY FEATURES. Aircraft Grade 6061-T6 Aluminum Free-Floating Barrel Design For Increased Accuracy Two-Piece Design for USSOCOM Allows For the Attachment of an M203 Grenade Launcher When Lower Rail Section is Removed. WAT INT manufacture premium quality products at a reasonable price. Battle-Tested, 6-Bolt Bolt-Up System . The Daniel Defense M4 URG, MK18 comes complete with bolt carrier group and charging handle, 10.3 Cold Hammer Forged Barrel, RIS II MK18 Rail System in Black or Flat Dark Earth, and Daniel Defense low profile gas block. Net Weight (kg)-3.35. Made with light but durable aircraft aluminium alloy. Decided to go all out and do a clone correct SOPMOD Block II MK18 / CQBR. The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. G&P DBALA2 APTIAL. The independently ambi GRIP-N-RIP Charging Handle accommodates left- and . Developed to meet the standards of USSOCOM, the Daniel Defense SOCOM M4A1 RISII features a 14.5" Cold Hammer Forged Barrel, the Daniel Defense M4A1 RIS II Rail System, a MK12 Low Profile Gas Block and a Daniel Defense Flash Suppressor. Content Included-. The MK12 Gas Block is only compatible with the RIS II (M4A1 & MK18) family of rail systems manufactured by Daniel Defense. GAS SYSTEM: Pinned Low Profile Gas Block CNC Machined of 4140 hardened steel and Mil-Spec Heavy Phosphate Coating, Carbine length, Direct Impingement; HANDGUARD: Daniel Defense M4A1 Rail Interface System (RIS) II, CNC Machined of 6061-T6 Aluminum, Type III Hard Coat Anodized FDE; RAIL LADDERS . . This foregrip option is incompatible with M203 UBGL. As important, special tools are not required to mount the M203 grenade launcher. Equipped with 4 mounts for installation of additional devices and accessories. Gas Block: FSP, Badger Ordinance Mk12 gas block, Daniel Defense Mk12 Gas Block. The Daniel Defense MK18 RIS II is designed to work specifically on the MK18 CQBR! No reviews yet View + Color Options. The Daniel Defense M4 URG MK18 FDE comes complete with bolt carrier group and charging handle, 10.3 Cold Hammer Forged Barrel, RIS II MK18 Rail System, and Daniel Defense low profile gas block. x1 GHK COLT M4A1 Daniel Defense RIS II GBBR. - Gas Block - Daniel Defense MK12 - Gas tube - Colt - Flash Hider - Surefire FH4P Model No: FH556RC-1/2-28 - Hand guard - Daniel Defense MK18 RIS II (FDE) - Forward Assist - Colt (tear . The FDE is at times hard to find. NFA Disclaimer Once this part is assembled into a complete firearm, it becomes a regulated item by the National Firearms Act (NFA). It is not compatible with any other Daniel Defense rail system. The M4A1 AR15 style Upper Receiver Group features the RIS II picatinny quad rail, which has been in use by US Special Operations Command (SOCOM) for the SOPMOD Block II program since 2005. Night Evolution M600 flashlight. . NFA DISCLAIMER. The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. 0 Trades. Trying to put an slr sentry 7 with a height of 1.4 inches inside the internal diameter of the RIS ii rail at 1.2. Two-Piece Design for USSOCOM Allows For the Attachment of an M203 Grenade Launcher When Lower Rail Section is Removed. It is normally what is wanted for an authentic clone build of the Block 2 M4A1. Madbull Daniel Defense MK18 ris II 9,5. KEY FEATURES: Aircraft Grade 6061-T6 Aluminum Free-Floating Barrel Design For Increased Accuracy Two-Piece Design for USSOCOM Allows For the Attachment of an M203 Grenade Launcher When Lower Rail Section is Removed. Developed to meet the standards of USSOCOM, the Daniel Defense SOCOM M4A1 RISII features a 14.5" (16" OAL Non-NFA)Cold Hammer Forged Barrel, the Daniel Defense M4A1 RIS II Rail System, a MK12 Low Profile Gas Block and a Daniel Defense Flash Suppressor. Features: Free-floating barrel design for . The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. Chrome Lined, Properly Staked Gas Key; HANDGUARD: Daniel Defense M4A1 Rail Interface System (RIS) II, CNC Machined of 6061-T6 Aluminum; RECEIVER EXTENSION: 6 Position Mil-Spec 7075-T6 . The Daniel Defense M4 URG, MK18 comes complete with bolt carrier group and charging handle, 10.3 Cold Hammer Forged Barrel, RIS II MK18 Rail System in Black or Flat Dark Earth, and Daniel Defense low profile gas block. Aircraft Grade 6061-T6 Aluminum; The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. Cast aluminum alloy receiver with CNC finishing and Colt stamped trademarksCNC machined Daniel Defense licensed RIS II aluminum alloy handguard with laser etched trademarks and one piece outer barrelIn-line MOSFET, 8mm bearing gearbox with quick-change spring guide fully compatible with most Version 2 gearbox upgradesNeodymium High Torque Motor, CNC high strength gears, full steel rack . Once this part is assembled into a complete firearm, it becomes a regulated item by the National Firearms Act (NFA). The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. Filter Show In-Stock Products Only 2 items MK12 Low Profile Gas Block $78.00 View .750 Clamp Low Profile Gas Block $69.00 View Showing items per page The Daniel Defense RIS II allows the individual operator to free float the M203 grenade launcher without additional parts. The GHK Colt M4A1 RIS II is also the SOPMOD Block 2 which is widely used by special operations forces in the United States military in different theaters around the world. As important, special tools are not required to mount the M203 grenade launcher. This highly accurate and durable rifle includes an adjustable gas block that allows for a consistent feel whether shooting suppressed or unsuppressed. Two-Piece Design for USSOCOM Allows For the Attachment of an M203 Grenade Launcher When Lower Rail Section is Removed. The Daniel Defense RIS II allows the individual operator to free float the M203 grenade launcher without additional parts. Aircraft Grade 6061-T6 Aluminum. 6 minutes ago . Barrel: Colt 14.5" Socom/Government Profile. The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. KEY . The Daniel Defense RIS II is to be used in conjunction with the MK12 low profile gas block. Not sure if it's just a tight fit but possible or a no go! UPPER RECEIVER: Mil-Spec with Indexing Marks and M4 Feed Ramps. Close. The M4A1 by Daniel Defense features the M4A1 RIS II which has been in use by US Special Operation Command (SOCOM) for the SOPMOD II Weapons System since 2005. As important, special tools are not required to mount the M203 grenade launcher. The Daniel Defense M4 URG, MK18 comes complete with bolt carrier group and charging handle, 10.3 Cold Hammer Forged Barrel, RIS II MK18 Rail System in Flat Dark Earth, and Daniel Defense low profile gas block. We offer free shipping on all orders, even guns & ammo! The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. Description Daniel Defense was awarded the Naval Surface Warfare Center - Crane Division contract for the MK12 low profile gas block. The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. Aircraft Grade 6061-T6 Aluminum; . MK 18 RIS II is specifically designed for an M4A1 carbine with Mk18 CQBR (Close Quarters Battle Receiver) upper receiver and 10.3" barrel. ? Length (mm)-820.0. It's grown in popularity in large part due to its utilization by Special Operators wielding it in the . The Daniel Defense RIS II is to be used in conjunction with the MK12 Low Profile Gas Block. The Daniel Defense upper comes complete with bolt carrier group and charging handle, 10.3 Cold Hammer Forged Barrel, RIS II MK18 Rail System, and Daniel Defense low profile gas block. The Daniel Defense RIS II allows the individual operator to free float the M203 grenade launcher without additional parts. Factory CA Version includes an installed 33.3 Tactical CalCatch maglock device and extended . The M4A1 is built around a 14.5 inch Cold Hammer Forged M4 Profile barrel with a permanently attached Daniel Defense Flash Suppressor.