With the above out of the way, let’s make sure that we are starting with an empty weapon. Once that is done, remove the upper receiver, pull out the charging handle and bolt carrier group (verify the chamber is empty a second time), and lastly, pull off the handguards.

You should now be looking at something similar to the below picture.








Take your box with the DD 7.0 Lite rail. You should find a rail, barrel nut collar, barrel nut, and 6 allenhead cap screws. There are also rail covers included, though they can wait to be installed.







To start out with your upper, we will need to pull the flash suppressor off. It comes off counter clockwise when looking at it from the front of the weapon.

Next, we need to brace the Front Sight Base (FSB) on something solid so we can drive the pins out. I use a piece of pine, but you can use whatever you have lying around that is solid, and won’t give. Carpeting or similar soft objects won’t help out any, it needs to absorb the blow we are about to impart upon it.







With the FSB braced, we need to use our punch and SOLIDLY hit the two pins in the FSB. If you look at each side of the pin, you should see that one side is a little fatter than the other. We want to drive the pins out toward the fat side. Sharp blows from the hammer will prevent the head of the pin from mushrooming. If you hit little smacks, you aren’t going to get it free, and you will only get frustrated. The bigger hammer theory works in this regard, so don’t be using your wife or moms little tack hammer.

When we have both of the pins out, the FSB will slide away from the barrel in the same direction as the Flash Suppressor. It may be hard to get it moving, but a few whacks with a board against the back of the FSB, or use of a mallet should get it moving. If its an old weapon, and it REALLY doesn’t want to move, you can heat the FSB with a torch, freeze the entire assembly, or use some penetrating lube and let it sit over night. Any one of these tricks has worked for people.