Years ago, I had my USC converted to a UMP. At the time, there were no aftermarket barrels made for them. The HK ones were hard to find and very expensive if you could find one. So I had my convertion done and left the 16 inch barrel in the gun. I now have some extra funds and am going to order an HDPS 8 inch barrel for my gun. I have my tax stamp already so everything is legal.
My question is, how hard is it to get the ejector lever back into the gun after I swap the barrels? It has been years since I took the gun apart to have the conversion done, and when it was returned to me it was back in one piece. I remember the barrel is pinned in with a single pin at the bottom of the barrel. I also remember that I knocked the ejector lever out and could not figure out how to put it back in.
Any information on how to easily swap my barrel would be great.