There have been a few different versions-Colt and Gunsite originally offered them at the same time a number of years ago (around 2005/06 if I remember right). Colt stopped but the Gunsmithy continued. The latest ones like I have were sourced through Davidson's-it's slightly different than the one from Gunsite; no forward slide serrations, black sights, rear vertical serrations. I'm still impressed with how it works and how tight it is.

Larry Vickers recently did a short video of "The Drill"-10 shots, 10 rounds, 10 seconds or less all from the low ready. If the pistol holds less than 10 rounds start with it holstered. I tried it this past weekend. Took me 4 tries before I stopped dropping shots outside the center (add 1 second for each one to your total time). I averaged 8 seconds each run. Really like this one. Using a holster from Ritchie, styled after the late Lou Alessi's DOJ model.