So....I bought this little flashlight, a MagLite XL50, at WallyWorld. I don't think that 'demo' button's going to work,:

for under $30
and fixed it, like this:


to my venerable Ruger 10/22 with the barrel clamp you see (Redbirdgunparts EBay $8.99 -shiipped!)
and damn if it doesn't work GREAT!
We have a coon v. chicken problem and this is an exceptional set up for coons out to 50 yds at night , very bright light for the money easily 100+lumens with a low power and srobe option, Highly recommended.
MP