So apparently I got stuck with what looks like a beat up first gen G20C. Not to much a worry, as I will be replacing many parts anyway, including the barrel with my new shiney 9x25 dillon lone wolf. my question is, since its gen1 (how do i really tell, serial number range chart anywhere?) can i get an aftermarket frame that has a rail on it? this is the biggest drawback, i loooove laser lights and was very much looking forward to having it on this as the light combo i have does not fit my 22 mosquito (frames to short to the trigger, wont seat right). ive looked but i cant find anyone that sells g20c frames! i dont care what its made of but id perfer it not be heavier (ie alum or steel). second question, if no one makes it, can i get a replacement 4th gen frame and still have it fit/function with all the old parts? if not, what will need changing if doable at all?