I was thinking of getting one of the Vang Comp oversized safeties to replace the plastic safety button on my Mossberg 500. http://www.brownells.com/.aspx/pid=19517/Product/MOSSBERG_500_590_OVERSIZED_SAFETY Can anyone comment on these? Though the Brownell's listing does not say for sure, I think these come as kits that have all the necessary parts to do a total safety replacement. Also, how much bigger are these than the standard safety? Something a little bigger would be OK, but I don't want something huge. Thanks!