Several years ago, I bought a 4E Knick SBT and found the ejector did not work. The post by Mr. Snyder is right on. I got the parts I needed from Mr. Jim Guild. He really preferred that I send him the gun to repair, but did sell me the parts. They took some fitting, but they worked and still do. I notice the telephone number I have for Mr. Guild is different from the one given, but as stated, the one I have is several years old.