need a little help

[user]

I have a rifle to do some work on but I have never heard of the brand. It is a Liberty Arms model 20,,22lr rifle.It was Mfg.in the phillipiens by squires Bingham mfg. co. inc. The piece won't fire two rounds in succession. The striker hits appear to be very light. I want to get new springs for the striker and bolt but don't know where to go for them. any help is greatly appreciated,,thanks.