I have a chance to snag a like new S&W 4513TSW 45 Tactical for $330. It seems like a fair price to me, maybe even a good one. This one has the cutout in the frame and the rail. I'm not a rail guy but I would like to have one railed 3rd Gen gun, and a .45 is always good. This guns appears different from the trypical 3rd Gen Smith with the cutout contour in the frame and the rail, but is there anything else different about them that isn't apparent to the eye?