RIS II R AIL INTERFACE SYSTEM II INSTALL ATION INSTRUCTIONS RIS II MODEL: M4A1 M4A1 FSP MK18 FREEDOM. PASSION. PRECISION.
WARNING! UNLOAD 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.
. TIGHTEN THE RAIL 3 Insert the four remaining 7/8" screws from the receiver toward the muzzle 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. Reinstall muzzle device. 4. ATTACH LOWER RAIL SECTION 4 Using the four slotted screws, attach the lower rail to the main body of the handguard. No thread locker is required. 5.
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