The 500A is a convenient, no wires set up that is always with the gun. For daylight prectice and to save a few ounces you can remove the batteries and lamp module and put in the supplied plug. If you do not want a vertical grip, it is not a bad system and costs a lot less than a RAS plus a separate light. The dual heat shielded handguards do retain a lot of heat, but if you are firing only semi auto, it probably is not an issue.
Here's the one I just sold:
[img]http://photos.ar15.com/ImageGallery/Attachments/DownloadAttach.asp?iImageUnq=6380[/img]
[img]http://photos.ar15.com/ImageGallery/Attachments/DownloadAttach.asp?iImageUnq=17793[/img]