No one buy this flask. It is a piece of garbage. It's mad e from cheap plastic. I had to trim the edges off the pin that you push in to let the poweder flow just so it would slide all the way back and forth on it's own from the spring pressure, rather than me having to force it closed. I am using JSG pwder and could only get about 5 grains to come out at a time. After one use it is back to not closing on it's own. Wate of $10.00.T/C 's U-view flask is pricy but work much better. I had to loosen the set screw a little to allow it to close on it's own from the spring pressure, but after that it was fine.