It's a limited-production performance center item. I would've thought they'd make their "tactical .357" on a 7-shot L-Frame with a shorter barrel, but I guess they wanted to put the rail way out on the end like that. *shrug*
The only problem would be holsters. It'd be hard to find a holster for that odd barrel profile, muchless for the gun with the light mounted. Heck, only a couple places are making holsters for 1911s with lights on them...