Recently I got a very good deal on an almost new Shield 2.0 9mm with the factory integrated Crimson Trace red laser. From what I've seen on-line it looks like the red and green laser assemblies are very similar if not identical in external dimensions. Can I replace the red laser with a green laser? Does S&W even sell the green laser assembly separately? Just to be clear I'm talking about the internal laser assembly and not replacing the whole frame. TIA