I have a 1970's vintage Ruger 44 Mag Carbine. I'v had jamming problems with it for years. There is a pin in the lifter assembly that works its way out and hangs up the lifter assembly. My gun smith says that the entire lifter assembly needs to be replaced. I called Ruger and they no longer have parts for this rifle. They suggested that I call Jack First. Again they have nothing. I have used a couple of search engines and not come up with anything in stock. So, I am looking for a lifter assembly and I'm wondering if anyone here might be able to point me in a direction.