Good find on the website Cdog! And awesome find within the site Grover! I might go with the A2 just for the tacticool look and since that's about the same price as thread protectors that I was seeing.
On a side note, how did you find this site? The only thing I can find for searching these days (ever since google got all anal about the gun thing) is slickguns, and they're not the greatest when you're looking for a very specific things...