http://www.competitionshootingstuff.com/ I have a left handed R5 for a 6mm Norma BR. I really like it. I only have two complaints. One is about my finish. I went with a mat black. It was powder coated and not finished like a M-16. Oh well that is just me. I am just that way. The finish I have is fine there is not anything wrong with it but it is my personal preference. The other thing is the mags are Machined and not stamped. They work great but seem cheap. I am a big fan of this R5 I have. Besides me bitching and I am bitching. It is a great stock system. I know I will be buying a second one for some other project in the future.
A friend of mine just finished building a left handed Eliseo tube gun with a pierce action and Benchmark barrel in 243 AI
that thing shoots too damn good.