CONGRATULATIONS!You have purchased the finest rail system available for your firearm. We have taken

great pride in engineering, designing and manufacturing this product for you, and

we hope you will appreciate the quality of the machining and the finish.

Daniel Defense guarantees every product we make. If for any reason you are not

100% satisfied with any of our products, contact us immediately so that we may

resolve your concerns ASAP. If you ever have any questions or comments about

Daniel Defense or our products, please do not hesitate to call or write.

DANIEL DEFENSE, INC.101 Warfighter Way • Black Creek, GA 31308866.554.GUNS (4867) • www.danieldefense.com

WARNINGUNLOAD FIREARM BEFORE BEGINNING INSTALLATION

>> Failure to unload the firearm may lead to serious injury or

death! >> Place the weapon on safe. >> Remove the magazine

and cycle the bolt to remove any round from the upper

receiver or chamber. >> Visually inspect the chamber to

make sure it is empty before proceeding with this installation

procedure. >> Be aware that you are solely responsible for

your actions and for your own safety as well as the safety of

those around you.

REV. 2.0 09.2011

© Daniel Defense, Inc. All Rights Reserved. Specifications Subject to Change.

KEY FEATURESLight Weight Free Floating Barrel DesignSteel Barrel NutUninterrupted Upper Rail PlatformRemovable Bottom Rail SectionPatented Bolt-Up™ Mounting SystemAircraft Grade AluminumMil-Spec Type III Hard Coat Anodized FinishMil-Spec 1913 Picatinny Rails and Fasteners

RAIL INTERFACE SYSTEM II [RIS II™] DESCRIPTIONThe RIS II™ from Daniel Defense features our patented “Bolt-Up System” which

provides modern flat-top upper receivers with a continuous, uninterrupted upper rail

platform and allows for simplified alignment to the host weapon upper receiver.

Every component of the RIS II™ has been meticulously assessed, thoroughly shot

and tested, improved upon, and manufactured tough enough to become the new

benchmark in AR rail systems. In fact, the RIS II™ was selected by SOCOM for the

SOPMOD II program. The RIS II™ also features a removable bottom rail section,

allowing the attachment of the M203 Grenade Launcher.

The Rail Interface System (RIS II™] is specifically designed for those who demand peak performance.

IMPORTANT NOTE: installation of this product involves modification to your firearm. If for any reason you are not comfortable performing this work, seek a competent gunsmith. Read all instructions prior to beginning installation.

TOOLS NEEDED FOR INSTALLATION: FLAT-TIP SCREWDRIVER ALLEN WRENCH (supplied) DD BBL NUT WRENCH (supplied)

INSTALLATION INSTRUCTIONSRAIL INTERFACE SYSTEM IIRIS II™

MADE IN THE USAPATENT# 7,716,865

RIS II™ MODEL: M4A1 M4A1 FSP GL/SSC GL/SSC FSP MK18 MK18 FSP

SPARE LOWER RAILATTACHMENT SCREW

SPARE LOWER RAILATTACHMENT SCREW

SPARE LOWER RAILATTACHMENT SCREW

SPARE LOWER RAILATTACHMENT SCREW

CONGRATULATIONS!By following these simple instructions, you have now successfully installed the finest free floating rail system available for your AR15-style rifle.

1. INSTALL BOLT-UP™ PLATE AND BARREL NUTWith the counter-bored side facing the muzzle, slide the RIS II™ Bolt-Up™ plate over the barrel all the way to the upper receiver. Then slide the barrel nut over the barrel and thread onto the upper receiver hand-tight. Make sure that the gas tube hole in the RIS II™ aligns with the gas tube hole on the upper receiver.

Tighten the Daniel Defense RIS II™ barrel nut to 50 ft/lbs using the Daniel Defense RIS II™ barrel

nut wrench. Bolt-Up™ plate will remain loose.

2. ALIGN AND ATTACH RAIL TO BOLT-UP™ PLATENote: With the barrel nut and the Bolt-Up™ plate installed properly, the Bolt-Up™ plate will still move.

Place the RIS II™ over the barrel and mate it with the Bolt-Up™ plate. Insert two screws from the muzzle end through the rail into the bottom two holes in the Bolt-Up™ plate and hand tighten.

M4A1 FSP ADDITIONAL STEP: Insert the front sight base into the FSP opening on the rail system, install the gas tube with the gas tube roll pin while the front sight base is inside the FSP opening. Once the gas tube is installed into the front sight base and inside the FSP opening, slide the rail system and the FSP onto the barrel as one unit. Stop when the FSP hits the shoulder of the barrel.

3. TIGHTEN THE RAIL AND REPLACE FSB PINSInsert the four remaining screws from the breach end of the rifle through the Bolt-Up™ plate into the RIS II™ and tighten all six screws to 29-32 in/lbs. using the supplied allen wrench in the following pattern: the center screws first, the bottom screws next, and the top screws last.

Replace taper pins in front sight block if used, reinstall the flash hider.

4. ATTACH LOWER RAIL SECTIONAttach the lower rail section to the upper rail section using the four Lower Rail Attachment Screws.

NOTE: M203 MOUNTING (DD RIS II rails except the MK18)1. Remove Lower Rail Assembly by loosening and then removing four (4) Lower Rail Attachment

Screws. Place two (2) of the Lower Rail Attachment Screws back into Lower Rail Assembly for safe keeping.

2. Locate M203 Hanger Tabs inside Upper Rail Assembly, and rotate downward.3. Install M203 Grenade Launcher by placing M203 Grenade Launcher engagement collar around

M4 Barrel, ensuring that M203 Alignment Roll Pin is in line with RIS II Upper Rail Assembly Alignment Slot.

4. Once M203 Grenade Launcher is seated properly, align M203 Hanger Tabs with the forward threaded holes on the M203 and install two (2) Lower Rail Attachment Screws through the tabs into the M203.

NOTE: Prior to performing the following installation, remove flash hider, front sight post/gas block (taper pins drive out from the ejection port side to the safety selector side), handguard cap and barrel nut. You do not need to remove the barrel.