Heck guys I've had my CVA bore light for years. Never had a problem with it or it breaking. I think is cost about $7.
The only alteration I did with it was put a small piece of masking tape over the LED to 'dim' the light a bit so I can examine the bore good. I always throw it in my pocket when I am going to the gun shop just in case I need it.
I wish they would make a smaller version for 45 cal MLs.