Hmmmmm... I'd previously either seen or heard of most of those sites / places. But... I haven't run across an `interchange list' and would be *very* interested in getting myself a copy.
BTW, I've put over 1K rnds through mine and have been generally satisfied with it's performance. About the only `problem?' I've had with mine is that it `tosses' the brass almost to "EBF Egypt" and makes `policing' one's brass quite difficult. {WAN GRIN!} For the time being I've been using sort of a `backstop' to catch the brass and drop it next to me whenever I'm shooting on my home range. I'd like to find a `brass catcher' that wasn't a `kludge' that I could use at `public?' ranges and not get incredulous stares doing it. Oh, I've found that the Burris Red Dot sight is a *great* accessory. (I'd *love* to have an ACOG or similar sight. But... *Ouch*! The buck$! {GRIN!} The Burris, at 35mm in dia., is an acceptable substitute.)