I just picked up my first shotgun, a Mossberg 500. It has a 18.5 barrel with a heat shield and a 5 shot magazine, and this is creating a problem. I want to install a light on it, but all the mounts I've seen seem to install right where the heat shield is bolted on. I'd like to keep the heat shield on, so are there any suggestions for a mount and a light? Budget minded, so please keep that in mind with the suggestions.