Save your money! I thought this was a nice alternative due to not being able to get the NEF a couple of months ago. The primer swells and won't allow the cylinder to rotate or open. I would like to make someone a grat deal on this piece of junk. I got tired of waiting for gun dog suppliers to have them available, so I went to local gunshop and picked my NEF two days after order. Probably paid a little more for it but got tired of cussing and fussing with junk.