I got fortunate enough to run accross a barely used one for $300 shipped. Performed very minor grinding with my Dremmel tool for about 5 minutes to mate it to my SP01. Now it functions flawlessly with federal Copper plated, Winchester HP, CCI, Aguila. Even better functioning than my Buckmark or Mosquito. Get one, you won't regret it. Just be careful with the filing/grinding and do it in small increments to keep a tight fit.