Here are the steps you'll need to take to make the swap
1. Remove your gas tube roll pin from your FSB
2. Remove Bolt Up Screws to allow easier access to your Taper Pins
3. Remove Taper Pins from FSB
4. Remove Flash Hider
5. Remove DDM4 Rail, FSB, and Gas Tube from around your barrel
6. Remove Barrel Nut
7. Remove your Gas Tube from your FSB so you can get them out of the rail. Once you do this reinstall your gas tube to your FSB and install gas tube roll pin.
8. Install RIS II Bolt Up Plate and Reinstall barrel nut
9. Remove Lower Rail from RIS II and insert FSB and Gas Tube Assembly. Take the Rail, FSB and Gas Tube and Install over the barrel.
10. Install Bolt Up Screws. The Four Longer Screws install from the Receiver Toward the Muzzle. The two shorter screws go on the bottom portion of the bolt up place and install from the muzzle toward the receiver. Tighten screws in an alternation pattern.
11. Install and seat the taper pins in the FSB. You can opt to do this prior to tightening down the bolt up system
12. Install RIS II Lower Rail and secure with provided slotted screws and washers
13. Reinstall your flash hider.
Whew! That was a mouthful. I don't think I forgot anything. If you run into any hurdles please hit me up at
[email protected].
S/F