Tools you will need: a hammer, a punch pin set, a front sight removal block, an AR15 armorers wrench, a large table vice, and some kind of vice block. 1. Pull back on the delta ring, and separate the handguard. Remove both halves. 2. The front sight is held in place with "taper pins". As the name implies, the pins are fatter on one side vs the other. They must drive out from the left to the right side. The block will make this effortless and take all the guess work out. 3. To reuse your gas tube you'll need to drive out the roll pin. There's no special hint I can give you to pull the tube out. If it's stuck, keep pulling. Some solvent/lube (breakfree) couldn't hurt. 4. Clamp the upper into the vice block of your choice. Use the armorers wrench to remove the Delta ring assembly and barrel nut. You may have to remove the muzzle device at this point, to remove/replace the gas block and delta ring. 5. Install your new parts per their instructions.