Quoted:
Patriot,
If you look on brownells web site they also have a tool for doing just what you want.  Its called an AR15/M16 Flash Suppressor Tap and Die for threading barrels the part numbers are 080-598-528 for the Tap and 080-598-529 for the Die.  They are $19.85 and $12.35 respectively.  I hope this helps.

Hershey

Thanks hershey I did see that but it still makes me nervous. I am very mechanically inclined but ruining this rifle would be like breaking up with Britney Spears. I have also been reading that you shouldn't silver solder the AR A@ brakes on but blind pin them. I'm not blind pinning anything. maybe i will wait until we are liberated next September and get a Vortex. I don't know. Thanks buddy.