They do make them for .40, and no, they won't hurt your pistol. As stated, probably won't cycle it, but every once in a while they do. I have some in .38, 9mm, .45, and .22. Effective range falls off sharply out past about 7', optimum range is about 5'.


Well behaved women never make history.~ Out back
Quit laughing...I think I broke something.

Fifteen is my limit on Schnitzen-Gruben, Baby...

I have OCD and ADD, so everything has to be perfect, but only for a minute.