And they have a set trigger that will fire if you breathe on it.
from 1/2 mile away! (yes i have had a go of 2 guns with set triggers (1 was a lepage)) i call them telepathic triggers, the gun could be on the firing point and you could be standing some distance away, if you thought about the gun going off it would do!
"Men occasionally stumble on the truth, but most of them pick themselves up and hurry off as if nothing had happened" Winston Churchill http://planetairgun.com/index.php