Put one of these on my shotgun:seems tough enough after some shooting. The LD25 I used is EXTREMELY bright and I really like the fact that they make a lot of flashlights that use rechargeable AA batteries. With the advent of good LED flashlights, I think you don't need to spend hundreds of dollars anymore.
http://www.fenixlight.com/newping.asp
http://www.fenixlight.com/newping.asp