what tools do i need

[MUKAK]

to build my lower?

pics would be great

[Rock6.3]

Straight slot screwdriver for the pistol grip.
Small punch and small hammer for the bolt release pin and trigger guard pins.
Reading glasses if your eyesight is no longer young.
Razor knife for the takedown pin spring/catches.

[cxr]

do a yahoo search for Ar lower build
there is a great youtube video and there are manuals/walkthroughs on AR15.com that will come up in your yahoo search

[Rock6.3]

Receiver vice blocks are not needed for the assembly of a stripped lower.

[dieselpower]

youtube with sound
a hammer and punch of some kind
a screwdriver
needlenose pliers
common sense

[Lead Waster]

My RRA LPK had a grip screw that needed a hex head driver...one long enough that you could reach into the grip, so a small IKEA allen key would not work.

I used the Harbour Freight 5 piece punch set (I think it's 5 piece). I also used a big glob of silly putty that I had instead of a vice. It stuck to the table and I just mushed the lower into it. Great for holding roll pins in position too.

I use a C-clamp to slowly push the trigger guard pin in. Works good too!

Don't forget electrical tape or something to cover your receiver to protect it from missed hammer strokes, etc. So easy to scratch the receiver (assuming it bothers you if it's scratched up)