Installation Instructions
NOTE: Prior to performing the following installation, remove ash 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.
TOOLS NEEDED FOR INSTALLATION:
• Flat-tip screwdriver
• Allen wrench (supplied)
• DD BBL nut wrench (supplied)
1. INSTALL BOLT-UP PLATE AND BARREL NUT
With the counter-bored side facing the muzzle, slide the RIS II
Bolt-Up Plate over the barrel all the way to the upper receiver,
ensuring the alignment tabs are directly under the picatinny rail
of your upper receiver. Then, slide the barrel nut over the barrel
and thread onto the upper receiver hand-tight.
Tighten the barrel nut to 55 ft/lbs using the Daniel Defense
barrel nut wrench. The Bolt-Up Plate will remain loose. Reinstall
low-prole gas block and gas tube.
2. ALIGN AND ATTACH RAIL TO BOLT-UP PLATE
Note: With the barrel nut and Bolt-Up Plate installed properly, the
Bolt-Up Plate will still move.
With the lower rail removed, place the RIS II over the barrel and
mate it with the Bolt-Up Plate. Insert two 3/4" screws from the barrel
toward the receiver into the bottom two holes in the Bolt-Up Plate
and hand tighten.
M4A1 FSP ADDITIONAL STEP: With the lower rail removed,
insert the front sight base and gas tube assembly into the FSP
opening on the rail system. Slide the rail system, front sight
base, and gas tube onto the barrel as one unit. Stop when the
front sight base hits the shoulder of the barrel. Reinstall taper
pins in the front sight base. Most taper pins will install from the
right to the left.
WARNING!
UNLOAD FIREARM BEFORE BEGINNING INSTALLATION
Failure to unload the rearm 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.
IMPORTANT NOTE: installation of this product involves modication to your rearm. If for any reason
you are not comfortable performing this work, seek a competent gunsmith. Read all instructions prior
to beginning installation.
SPARE LOWER RAIL
ATTACHMENT SCREW
1
SPARE LOWER RAIL
ATTACHMENT SCREW
2