I got the pin out using a tiny 4 head screw. The only problem was that the new inner barrel didn't fit on it because there was indent on the original barrel soo... i used my leatherman & filed it down to the right indent.
pics:
http://img96.imageshack.us/img96/8965/19da.jpg
http://img478.imageshack.us/img478/6238/21qn.jpg
Original Barrel:
http://img511.imageshack.us/img511/8880/51zv.jpg
Modded Barrel:
http://img57.imageshack.us/img57/277/34un2.jpg
http://img478.imageshack.us/img478/4118/47kw1.jpg