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You need to remove the two pins that hold the front sight/gas block (they're tapered on most guns so only remove one direction), and the gas tube roll pin after removing the flash hider.

You'll need:

Action Block to hold your receiver in your vise
A wrench for the FH
A poly or wood block with holes in it to back your FH while you pound out the pins
A set of short, high quality steel punches for the FH pins (brass, or long punches will bend, but will work fine for the gas tube roll-pin)
A big hammer

IMO the barrel is the hardest part to install correctly for a newb, and an A2 gas block is the hardest part to remove.

ETA: You should check out ar15.com, they have a step by step assembly guide.
 
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