I bought one of their mid length LW barrels to build a retro-ish carbine (think a stretched 733).
I built a 603 clone using a DEZ arms A1 profile 20" barrel. It isn't chrome lined, it's a 1/7" twist (I wanted that or 1/9") and is plenty accurate. IIRC, I needed to send it to ADCO to have them pin the FSB for me - that wasn't something I was ready to do at home.
http://img833.imageshack.us/img833/7863/ar603clone.jpg

