It's my understanding the barrels that Tony has now are made by Merkel. They will need to be fitted to the gun. I bought a set and thought I could fit them myself. I ended up sending the gun and the barrels back to Tony for fitting. I was not real happy with the fitting job. They where very tight and there was a gap at the dolls head extension. However they did shoot spot on. And yes the forearm will be fitted also. If you get real lucky, they may fit with no fitting. You take your chances.