I seen watched that FPS vid the other day. Thought it was oretty neat and did some searchingto find out more about it. Does not seem to be too shabby but would prefer a Magnum Research in 357 or 44 or 50, ah he'll one of each and not just the barrelkits.
Grizzly is an upsized 1911. The 45 win mag is pretty stout and not something you'll burn through a few hundo rounds at the range. The 357 conversion kit, however, is a kitten to shoot and a lot of fun.