OK, I couldn't really find the right place to post this so here goes. I can't spend $100 or more on a tactical style flashlight for my shotgun BUT, I am now seeing LED flashlights in the sporting goods section of retail stores. With some machining of a custom bracket for the magazine end cap of an 870, I could firmly attach one of them to my home defense gun and come up with a momentary switch setup. Are the LED lights so rugged they could hold up to recoil? What bulbs do the real tactical lights use?? Thanks.