GreenO, Try this:
Cut two pieces of 4x4x1/2" oak liberated from an oak pallet. Take a Dremel tool and cut a channel in them across the grain. If you don't have a Dremel, just use a regular cross cut saw and a round file to make a channel about 1/3" deep. You want to make a round channel that's deep enough to get a good grip on your barrel. Go to a sporting goods store and get a $1 bag of rosin that baseball guys and weightlifters use. Dust the channel and place in a bench vise. Insert barrel forward of your front sight into the channel and tighten it down with the narrow part of the pins facing up, so you can look down on them and also soak them with oil while you're at it. Tap them out.
Here's a pic:
[url]http://www.ofoto.com/PhotoView.jsp?collid=25558273403&photoid=180495460103&UV=190373748447_763675460103&refreshkey=1064076902966[/url]
You can also scroll through that album and see two other pics of the blocks. I've used those blocks on around fourteen or so barrelling projects and they're still going strong. Cheap, too.
It will work, just think through it and have patience. It isn't rocket science, but I know it can be frustrating, and I was, too, until I figured out this method.
I just used those on a preban colt upper that I bought. I was installing freefloat handguards and had to remove the front sight post.
You should get new tapered pins, too.
Jim